US Pat. No. 9,197,128

APPARATUS AND METHODS FOR VOLTAGE CONVERTER BYPASS CIRCUITS

SKYWORKS SOLUTIONS, INC.,...

1. A voltage conversion system comprising:
a voltage converter including an inductor, a plurality of switches, and a bypass circuit, the bypass circuit including a first
p-type field effect transistor, a second p-type field effect transistor, a first n-type field effect transistor, and a second
n-type field effect transistor, the first and second n-type field effect transistors electrically connected in series between
a first end and a second end of the inductor, and the first and second p-type field effect transistor transistors electrically
connected in series between the first end and the second end of the inductor; and

a control circuit configured to selectively open or close the plurality of switches to control an inductor current through
the inductor, the control circuit further configured to selectively activate the bypass circuit to reduce ringing of the inductor
current.

US Pat. No. 9,614,494

REACTANCE FILTER COMPRISING ACOUSTIC WAVES RESONATORS

SNAPTRACK, INC., San Die...

1. A reactance filter comprising:
a series branch within which a plurality of series impedance elements that are coupled in series; and
a plurality of parallel branches each having a parallel impedance element, each parallel impedance element being coupled to
a node that is coupled to a respective series impedance element,

wherein each impedance element comprises a resonator that works with acoustic waves,
wherein the resonators in the series branch comprise a first piezoelectric material,
wherein the resonators in the parallel branches comprise a second piezoelectric material that is different than the first
piezoelectric material,

wherein the first piezoelectric material has a smaller coupling coefficient than the second piezoelectric material, and
wherein a capacitance element is coupled parallel to at least one of the resonators in the series branch.

US Pat. No. 10,076,035

MINIATURIZED MULTI-PART COMPONENT AND METHOD FOR PRODUCING SAME

SnapTrack, Inc., San Die...

1. A component, comprisinga carrier;
a plurality of functional structures on the carrier;
a plurality of thin-film covers, each of the plurality of thin-film covers being over a different one of the plurality of functional structures, wherein the plurality of functional structures comprises a microelectromechanical system (MEMS) structure, a microacoustic structure, a surface acoustic wave (SAW) structure, a bulk acoustic wave (BAW) structure, and a guided bulk acoustic wave (GBAW) structure; and
a circuit part over one of the plurality of thin-film covers, wherein the circuit part is connected to a functional structure of the plurality of functional structures by a lead.

US Pat. No. 9,294,043

APPARATUS AND METHODS FOR CALIBRATING ENVELOPE TRACKERS

SKYWORKS SOLUTIONS, INC.,...

1. A power amplifier system comprising:
a variable gain amplifier (VGA) configured to amplify a radio frequency (RF) input signal to generate an amplified RF input
signal, the VGA having a variable gain;

a power amplifier configured to amplify the amplified RF input signal to generate an RF output signal, the power amplifier
configured to receive power from a supply voltage;

an envelope tracker configured to generate the supply voltage, the envelope tracker including a scaling module configured
to generate a scaled envelope signal based on a power control level (PCL) signal and an envelope signal that changes in relation
to an envelope of the RF input signal, the envelope tracker further including an envelope shaping table including shaping
data relating a plurality of scaled envelope signal amplitudes to a plurality of supply voltage levels, the envelope tracker
configured to control the voltage level of the supply voltage based on the scaled envelope signal and the envelope shaping
table; and

a calibration module including calibration data, the calibration module configured to control the variable gain of the VGA
with the calibration data to compensate for an envelope amplitude misalignment of the envelope tracker.

US Pat. No. 9,209,751

PARALLEL CORRECTION AMPLIFIER

SNAPTRACK, INC., San Die...

1. A power supply stage comprising:
a stage for generating an intermediate supply signal in dependence on a reference signal representing a desired power supply;
a plurality of correction amplifiers, each adapted to generate a corrected signal based on an output power supply voltage
of the power supply stage and wherein the corrected signal tracks the reference signal; and

a combiner for combining the plurality of generated corrected signals and the intermediate supply signal to provide the output
power supply voltage with higher output current capability.

US Pat. No. 9,571,152

APPARATUS AND METHODS FOR CALIBRATION OF ENVELOPE TRACKERS

SKYWORKS SOLUTIONS, INC.,...

1. A power amplifier system comprising:
a variable gain amplifier configured to amplify a radio frequency input signal to generate an amplified radio frequency input
signal, the variable gain amplifier having a variable gain that is controllable by a gain control level signal;

a power amplifier configured to amplify the amplified radio frequency input signal to generate a radio frequency output signal,
the power amplifier configured to receive power from a supply voltage; and

an envelope tracker configured to generate the supply voltage, the envelope tracker including a scaling module configured
to generate a scaled envelope signal based on a power control level signal and an envelope signal that changes in relation
to an envelope of the radio frequency input signal, the envelope tracker further including a calibration module configured
to control an amount of scaling of the scaled envelope signal based on calibration data to compensate for an envelope amplitude
misalignment of the envelope tracker, the envelope tracker further configured to control a voltage level of the supply voltage
based on the scaled envelope signal.

US Pat. No. 9,641,132

HIGH EFFICIENCY AMPLIFICATION

SNAPTRACK, INC., San Die...

1. A power supply stage, comprising:
a combiner configured to combine a switched supply signal with a correction signal, and configured to generate a corrected
supply signal;

a correction stage, coupled to the combiner, configured to generate the correction signal in dependence on a difference between
a reference signal and the corrected supply signal; and

a supply stage, coupled to the correction stage, configured to provide the switched supply signal,
wherein the supply stage is configured to provide the switched supply signal independent of the correction signal.

US Pat. No. 9,613,587

APPARATUS AND METHOD FOR ADAPTIVE IMAGE RENDERING BASED ON AMBIENT LIGHT LEVELS

SNAPTRACK, INC., San Die...

1. An apparatus comprising:
a memory component storing mapping data, which maps a plurality of ambient illumination ranges to respective bit-depth values
for each component color subfield of a plurality of component color subfields used to display an image, the mapping data including:

a first bit-depth value associated with a first component color subfield of the component color subfields and mapped to a
first ambient illumination range, and

a second bit-depth value, different than the first bit-depth value, associated with the first component color subfield of
the component color subfields and mapped to a second ambient illumination range that is different from the first ambient illumination
range; and

a controller configured to:
obtain an indication of an ambient illumination level;
receive image data associated with an image frame;
derive pixel intensity values for the component color subfields based on the received image data for displaying the image
frame;

determine for each of the component color subfields a respective number of subframes to be used to display the image frame,
using the mapping data and the obtained ambient illumination level;

generate a set of subframes for each component color subfield based on the determined respective number of subframes; and
cause the image frame to be displayed according to the determined respective number of subframes.

US Pat. No. 9,331,636

TIME AND AMPLITUDE ALIGNMENT IN ENVELOPE TRACKING AMPLIFICATION STAGE

SNAPTRACK, INC., San Die...

1. A method of calibrating an envelope path and an input path of an amplification stage including an envelope tracking power
supply, the method comprising:
generating input signals having a known relationship for each of the input and envelope paths;
amplifying the signal in the input path with an amplifier powered by the envelope tracking power supply to generate a signal
at an output of the amplification stage;

detecting the power in the signal at the output of the amplification stage; and
varying an amplitude and a delay of the signal in one of the envelope and input paths in order to reduce the variation in
the power detected in the signal at the output of the amplification stage.

US Pat. No. 9,350,302

REDUCED BANDWITH OF SIGNAL IN AN ENVELOPE PATH FOR ENVELOPE TRACKING SYSTEM

SNAPTRACK, INC., San Die...

1. An envelope tracking power amplifier system comprising an RF path and an envelope path, the envelope path comprising:
a plurality of envelope detectors for detecting the envelope of a plurality of frequency bands of an input signal and each
generating an output signal; and

a combiner for combining the output of the envelope detectors.

US Pat. No. 9,350,246

CONTROL OF MULTI-LEVEL SUPPLY STAGE

SnapTrack, Inc., San Die...

1. A buck-boost converter including a voltage generation apparatus comprising: a voltage source (110); an inductor (108), wherein a first terminal of the inductor is switchably connected to the voltage source; and a plurality of capacitors (202) switchably connected to a second terminal of the inductor, wherein a respective plurality of output voltages are formed
across the plurality of capacitors (202), characterised by further comprising: an error determination block (302) which determines an error in each of the plurality of voltages, a mean error in dependence thereon, and an error deviation
from the mean error for each of the plurality of output voltages; and a controller comprising a control loop (304) adapted to switchably connect one of the plurality of capacitors (202) to the second terminal of the inductor in dependence on the plurality of error deviations; and a control loop (306) adapted to control switching between a buck mode and a boost mode in dependence upon the mean error.

US Pat. No. 9,270,230

POWER SUPPLY ARRANGEMENT FOR MULTI-STAGE AMPLIFIER

SNAPTRACK, INC., San Die...

1. A multi-stage amplifier comprising:
a first amplifier stage;
a second amplifier stage; and
a voltage supply stage arranged to provide a supply voltage to the first amplifier stage in dependence on an average power
of a signal to be amplified and a supply voltage to the second amplifier stage in dependence on an instantaneous power of
the signal to be amplified, wherein there is provided an average supply determination block for determining the average of
the supply generated by the supply voltage stage, and providing the supply voltage to the first amplifier stage in dependence
upon the determined average,

wherein the voltage supply stage is arranged to selectively provide supply voltages to the first and second amplifier stages,
wherein in a first mode of operation the signal is amplified by the first and second amplifier stages, and the supply voltage
stage is selected to provide a supply voltage to the first amplifier stage in dependence on the average power of the signal
to be amplified and the second amplifier stage in dependence on the instantaneous power of the signal to be amplified, and
in a second mode of operation the second amplifier stage is bypassed, the signal being amplified by the first amplifier stage,
and the supply voltage stage is selected to provide a supply voltage to the first amplifier stage in dependence on the instantaneous
power of the signal to be amplified.

US Pat. No. 9,225,292

POWER CONTROL

SNAPTRACK, INC., San Die...

1. An amplification stage comprising:
an input scaling block for scaling an input signal in dependence on at least one scaling factor to generate a scaled version
of the input signal;

a power amplifier for amplifying the scaled version of the input signal;
an envelope detector for generating an envelope signal representing an envelope of the input signal;
a non-linear mapping block for scaling the envelope signal in dependence on the scaling factor to generate a shaped version
of the envelope signal; and

a modulator for generating a power supply voltage for the power amplifier in dependence on the shaped version of the envelope
signal.

US Pat. No. 9,648,743

MULTILAYER GLASS CERAMIC SUBSTRATE WITH EMBEDDED RESISTOR

SNAPTRACK, INC., San Die...

1. A multilayer glass ceramic substrate comprising:
a plurality of insulating layers composed of glass ceramics;
an embedded resistor formed between the insulating layers, wherein the resistor includes scattered microvoids and is comprised
of materials containing conductive powders and glass powders, wherein an average size of the scattered microvoids is 3 ?m
or less, and wherein the average size of the scattered microvoids is 0.92 ?m or more; and

a first and a second internal conductor, wherein a first end of the embedded resistor is connected to the first internal conductor
and a second end of the embedded resistor is connected to the second internal conductor;

wherein a softening point of glass powders used for the resistor is expressed by Tr1;

wherein the softening point of glass powders used for the insulating layers is expressed by Tc1;

wherein Tc1-110?Tr1?Tc1+70 in degrees Celsius; and

wherein 750° C.?Tc1?800° C.

US Pat. No. 9,491,314

VOLTAGE BOOST FOR ET MODULATOR

SNAPTRACK, INC., San Die...

1. A voltage supply stage comprising an input supply voltage, a first and second switch connected in series, the first and
second series-connected switches being connected in parallel with the input supply voltage between first and second terminals
of the input supply voltage, a third switch and capacitor connected in series, the series-connected third switch and capacitor
being connected in parallel with the first switch, a fourth switch connected between the connection of the third switch and
the capacitor and an output, and a fifth switch connected between the output and a terminal of the input supply voltage, wherein:
in a first phase of operation, the first and the fourth switch are closed, and the second, third and fifth switches are open;
in a second phase of operation, the second, third and fifth switches are closed, and the first and fourth switches are open;
and

a duty cycle of the first and second phases is controlled such that an average voltage on the output varies between 0 volts
and twice the input supply voltage.

US Pat. No. 9,379,671

PARALLEL CORRECTION AMPLIFIER

SnapTrack, Inc., San Die...

1. A power supply stage comprising:
a stage configured to generate an intermediate supply signal in dependence on a reference signal representing a desired power
supply;

a plurality of correction amplifiers, each adapted to generate a respective corrected signal tracking the reference signal,
and wherein the corrected signal is based on a feedback signal;

at least a first combiner adapted to combine each of the respective corrected with the intermediate supply signal to generate
a plurality of adjusted signals, wherein each of the adjusted signals provides power to a respective power amplifier; and

at least a second combiner adapted to combine the plurality of adjusted signals to generate the feedback signal.

US Pat. No. 9,496,825

POWER SUPPLY ARRANGEMENT FOR MULTI-STAGE AMPLIFIER

SnapTrack, Inc., San Die...

1. A multi-stage amplifier comprising:
a driver amplifier stage;
a power amplifier stage;
a switched supply stage arranged to provide a supply voltage to the driver amplifier stage in dependence on an average power
of a signal to be amplified;

an envelope tracking modulated power supply stage arranged to provide a supply voltage to the power amplifier stage in dependence
on an instantaneous power of the signal to be amplified, wherein the envelope tracking modulated power supply stage is configured
to track an envelope of the signal to be amplified faster than the switched supply stage;

means for determining an average of the supply voltage provided by the envelope tracking modulated power supply stage, wherein
the supply voltage is provided to the driver amplifier stage in dependence upon the determined average; and

a sample-and-hold stage for sampling the determined average.

US Pat. No. 9,385,663

ENVELOPE TRACKING PUSH-PULL OR DIFFERENTIAL POWER AMPLIFIER

SNAPTRACK, INC., San Die...

1. A power amplifier arrangement comprising:
first and second active devices for amplifying in-phase and anti-phase parts of an input signal;
a first DC supply network connected between an output of the first active device and an output of a modulator;
a second DC supply network connected between an output of the second active device and the same output of the modulator; and
an output combiner for combining the amplified in-phase and anti-phase parts of the input signal, wherein the output combiner
comprises a lumped element inductor-capacitor balun.

US Pat. No. 9,385,680

CREST FACTOR REDUCTION APPLIED TO SHAPING TABLE TO INCREASE POWER AMPLIFIER EFFICIENCY OF ENVELOPE TRACKING AMPLIFIER

SnapTrack, Inc., San Die...

1. A method of controlling an input to an envelope modulated power supply of an envelope tracking amplification stage, the
method comprising:
generating an envelope signal representing an envelope of a signal to be amplified;
applying a shaping function to the envelope signal to generate a shaped envelope signal, wherein the applying comprises clipping
the shaped envelope signal at high values of the envelope signal; and

providing the shaped envelope signal as the input to the envelope modulated power supply.

US Pat. No. 9,356,559

CONTROL LOOP FOR AMPLIFICATION STAGE

SnapTrack, Inc., San Die...

1. A control stage comprising:
a first path for receiving an input signal and for generating a replica signal representing the low frequency content of such
signal;

a second path for receiving the input signal and for generating an error signal representing an error in the replica signal,
the second path including:

a delay stage for generating a delay signal being a delayed version of the input signal, over a frequency range of interest,
the delay amount corresponding to a time delay of the first path in generating the replica signal from the input signal; and

a difference block for receiving as inputs an output signal and the delay signal and for generating the error signal, wherein
the delay stage applies a delay to generate the delayed version of the input signal such that the signals at the two inputs
of the difference block are substantially identical over the frequency range of interest, and the low frequency content of
the error signal generated by the difference block is thereby reduced such that the difference block does not provide substantially
any output power over the frequency range of interest; and

a combiner for combining the replica signal with the error signal to generate the output signal, wherein the combiner is not
required to handle low frequency signals in the error signal.

US Pat. No. 9,257,941

ADAPTIVE BIASING SCHEME FOR AN AMPLIFIER

SNAPTRACK, INC., San Die...

1. A bias arrangement for an amplifier adapted to amplify a varying input signal, the arrangement comprising:
a current source configured to generate a bias current; and
a control circuit configured to adaptively vary the bias current to the amplifier in dependence on an envelope of the varying
input signal, the control circuit including a peak detection circuit configured to track the envelope of the varying input
signal and to provide an output, which is proportional to the instantaneous magnitude of the varying input signal, for controlling
the variation of the bias current, wherein the control circuit includes a bias modulation circuit responsive to the output
of the peak detection circuit and arranged to control the current source in dependence thereon.

US Pat. No. 9,252,724

2G SUPPORT FOR 2G AND 3G/4G ENVELOPE TRACKING MODULATOR

SNAPTRACK, INC., San Die...

1. An amplification stage including an envelope tracking modulated supply for tracking a reference signal, comprising a low
frequency path for tracking low frequency variations in the reference signal and for providing a first output voltage, and
a high frequency path for tracking high frequency variations in the reference signal and for providing a second output voltage,
and a combiner for combining the first and second output voltages to provide a third output voltage, the amplification stage
further comprising a first power amplifier arranged to receive the first output voltage as a supply voltage, and a second
power amplifier arranged to receive the third output voltage as a supply voltage, wherein the first and second amplifiers
are enabled in different modes of operation.

US Pat. No. 9,172,341

POWER SUPPLY PRE-DISTORTION

SNAPTRACK, INC., San Die...

1. A method of generating a supply voltage for a power amplifier arranged to amplify an input signal, comprising:
generating a target supply voltage tracking the input signal;
pre-distorting the target supply voltage to compensate for the effects applied to the supply voltage between an input terminal
of the amplifier and a node of an active element of the amplifier to which the modulated supply voltage is applied; and

generating the supply voltage for the amplifier in dependence on the pre-distorted target supply voltage.

US Pat. No. 9,148,879

METHOD FOR TRIGGERING TERMINAL TO SEND SOUNDING REFERENCE SIGNAL, TERMINAL, AND BASE STATION

SNAPTRACK, INC., San Die...

1. A method for triggering a terminal to send a sounding reference signal, the method comprising:
configuring at least two sets of resource information for the terminal through higher-layer signaling, wherein each set of
resource information indicates a candidate resource for the sounding reference signal;

selecting a resource for the terminal in at least two candidate resources respectively indicated by the at least two sets
of resource information; and

sending a triggering Physical Downlink Control Channel (PDCCH) to the terminal on a trigger subframe, so as to trigger the
terminal to utilize the selected resource to send the sounding reference signal, wherein the trigger subframe is for indicating,
to the terminal, a subframe to which the selected resource is applied.

US Pat. No. 9,438,171

MULTIPLYING CURRENT CONVEYOR FOR AMPLIFIER

SNAPTRACK, INC., San Die...

1. A circuit having a first transistor being a common gate connected transistor and a second transistor, the second transistor
being M times the size of the first transistor, the first and second transistors having commonly connected gates and commonly
connected drains, wherein an apparatus is provided to regulate the source voltage of the second transistor to track the source
voltage of the first transistor, wherein the current gain of the circuit is M+1, and wherein the drain of the first transistor
provides the output of the circuit.

US Pat. No. 9,401,159

VOICE REMOTE CONTROL

SNAPTRACK, INC., San Die...

1. A device, comprising:
a display; and
logic configured to:
receive a selection of a first control action associated with an application stored in the device,
provide a plurality of choices associated with the first control action,
receive a word or a phrase to use as a voice command corresponding to the first control action, wherein the word or phrase
is selected from the plurality of choices,

associate the word or phrase with the first control action,
receive voice input from a user,
identify the voice input as corresponding to the word or phrase, and
perform the first control action based on the identified voice input.

US Pat. No. 9,385,605

SWITCHED MODE POWER SUPPLY WITH A BYPASS PATH FOR SHUNTING CURRENT

SNAPTRACK, INC., San Die...

1. A switching stage comprising:
a first switching path having at least one switching element for selectively connecting an input of the switching stage to
an output of the switching stage; and

a second switching path having at least one switching element for selectively connecting the input of the switching stage
to the output of the switching stage,

wherein the first and second switching paths are controlled such that a signal is selectively routed from the input of the
switching stage to the output of the switching stage via the first and second switching paths in dependence on the current
of the signal to be routed,

wherein the at least one switching element of the second switching path is selectively connected to route the signal from
the input to the output such that with the at least one switching element of the second switching path in a first state, the
current in the second path rises until a first current threshold level is reached, responsive to which condition the at least
one switching element of the second switching path is switched to a second state, and

wherein in the second state the current in the second path falls until a second current threshold level is reached, responsive
to which condition the at least one switching element of the second switching path is switched to the first state, wherein
there is provided a further switching element in the second switching path arranged to selectively connect a first terminal
of a first inductor to a higher voltage level, wherein the connection to the higher voltage level is enabled responsive to
the current in the second switching path falling to the second threshold level when the at least one switching element of
the second switching path is in the first state.

US Pat. No. 9,118,278

HIGH EFFICIENCY AMPLIFICATION

SnapTrack, Inc., San Die...

1. An apparatus comprising:
a controller arranged to receive a digital envelope signal, the controller comprising:
a digital-to-analog converter for converting the digital envelope signal into an analog envelope signal; and
a digital controller for generating a digital control signal for a switching stage in dependence on the digital envelope signal,
a modulated supply stage comprising:
a switching stage for receiving the digital control signal and for selecting one of a plurality of supply voltages in dependence
on the digital control signal;

a combiner for combining the selected supply voltage with an error signal, and for providing a power supply signal; and
an error amplifier for receiving the analog input signal and the output of the combiner and for generating the error signal;
an analog interface for connecting the analog input signal from the controller to the modulated stage; and
a digital interface for connecting the digital control signal from the controller to the modulated supply stage.

US Pat. No. 9,844,128

CASED ELECTRICAL COMPONENT

SnapTrack, Inc., San Die...

1. A cased electrical component, comprising:
a carrier substrate;
a spring device arranged on the carrier substrate;
a chip coupled to the spring device at a first side of the chip;
a covering element arranged on the carrier substrate,
wherein the covering element is arranged over the chip such that the covering element touches the chip at least at a second
side of the chip, the second side being different from the first side,

wherein the covering element has at least one first layer comprising a plastic material and at least one second layer, arranged
on the first layer, comprising a metal, and

wherein the first layer of the covering element has a first section touching the chip at the at least one second side of the
chip; and

a bearing element arranged on the carrier substrate,
wherein the bearing element is embodied such that the first side of the chip at least partly bears on the bearing element,
wherein the first layer of the covering element has a second section touching the bearing element and a third section arranged
on the carrier substrate,

wherein the second section of the first layer of the covering element has a cutout, and
wherein the second layer of the covering element is contact-connected to the bearing element through the cutout.

US Pat. No. 9,391,510

SWITCH MODE POWER SUPPLY FOR ENVELOPE TRACKING

SNAPTRACK, INC., San Die...

1. An envelope tracked power supply comprising a high bandwidth, low delay closed loop switch mode power supply stage, comprising:
a single pulse width modulator for generating a width modulated pulse in dependence on an input signal and an output voltage
of the switch mode power supply stage;

a single wideband transformer, having a winding of a first side connected to receive the modulated pulse, and first and second
windings of a second side;

a first transistor having a conductive path connected between a first supply voltage and an output of the switch mode power
supply stage;

a second transistor having a conductive path connected between a second supply voltage and the output of the switch mode power
supply stage; and

an anti-shoot-through circuit comprising:
a first circuit comprising:
a third transistor connected to receive a modulated pulse induced in the first winding of the second side of the transformer
at a control node of the third transistor; and

a fourth transistor connected to receive the modulated pulse induced in the first winding of the second side of the transformer
at a control node of the fourth transistor, wherein an emitter of the third transistor and an emitter of the fourth transistor
are connected with a control node of the first transistor; and

a second circuit comprising:
a fifth transistor connected to receive a modulated pulse induced in the second winding of the second side of the transformer
at a control node of the fifth transistor; and

a sixth transistor connected to receive the modulated pulse induced in the second winding of the second side of the transformer
at a control node of the sixth transistor, wherein an emitter of the fifth transistor and an emitter of the sixth transistor
are connected with a control node of the second transistor.

US Pat. No. 9,385,662

SUPPLY MODULATOR

SNAPTRACK, INC., San Die...

1. An envelope tracking supply modulator, comprising:
a switch mode path; and
a linear amplifier path, wherein the linear amplifier path includes a plurality of linear amplifiers, each linear amplifier
having an output stage of a different size, wherein at least one of the plurality of linear amplifiers is enabled in dependence
on an output power, and wherein each of the plurality of linear amplifiers is configured to be enabled based on a separate
control signal.

US Pat. No. 9,379,631

HIGH EFFICIENCY VARIABLE VOLTAGE SUPPLY

SNAPTRACK, INC., San Die...

1. A power supply for generating an output supply voltage, comprising:
a high efficiency variable voltage supply configured to generate an intermediate supply voltage in dependence on a reference
signal; and

an adjusting circuit, comprising:
a correction circuit configured to generate an error signal based on the output supply voltage or the intermediate supply
voltage; and

a combiner configured to:
combine the intermediate supply voltage and the error signal; and
provide the output supply voltage tracking the reference signal in dependence thereon.

US Pat. No. 9,461,540

ASYNCHRONOUS SWITCH MODE POWER SUPPLY

SNAPTRACK, INC., San Die...

1. An asynchronous switch mode power supply comprising:
a subtractor for subtracting an output of the switch mode power supply from a reference signal;
a filter for filtering the subtracted output;
a quantizer for generating a plurality of quantizer outputs in dependence on the filtered subtracted output; and
a power switch stage for connecting one of a plurality of supply voltages to the output of the switch mode power supply in
dependence on the quantizer outputs.

US Pat. No. 9,184,704

TIMING ALIGNMENT FOR POWER AMPLIFIER

SNAPTRACK, INC., San Die...

1. A method of controlling signal alignment in a power amplifier, comprising:
receiving an input signal to be amplified;
receiving a supply voltage for the power amplifier, the supply voltage being derived in dependence on the signal to be amplified;
amplifying the input signal to produce an output signal;
comparing the output signal with a plurality of distorted versions of the input signal, each distorted version of the input
signal being associated with a different time delay value; and

adjusting timing of either the input signal or the supply voltage by an amount in dependence on a time delay value determined
to be associated with one of the plurality of distorted versions of the input signal.

US Pat. No. 9,605,965

MICROMACHINED PIEZOELECTRIC X-AXIS GYROSCOPE

SnapTrack, Inc., San Die...

1. A method of fabricating a gyroscope, the method comprising:
depositing conductive material on a substrate;
forming an anchor on the substrate;
forming a drive frame on the anchor;
forming pairs of drive beams on opposing sides of the anchor, the drive beams connecting the drive frame to the anchor, the
drive beams being configured to constrain the drive frame to rotate substantially in a plane of the drive beams;

forming a proof mass around the drive frame; and
forming a plurality of sense beams that connect the drive frame to the proof mass, the sense beams being tapered sense beams
having a width that decreases with increasing distance from the anchor, the tapered sense beams being configured to allow
sense motions of the proof mass in a sense plane substantially perpendicular to the plane of the drive beams in response to
an applied angular rotation.

US Pat. No. 9,438,913

METHOD, APPARATUS AND SYSTEM FOR EVALUATING QUALITY OF VIDEO STREAMS

SNAPTRACK, INC., San Die...

1. A method for evaluating quality of video streams, comprising:
obtaining a sequence of video frames for one or more video streams;
obtaining coding information associated with video frames in the sequence of video frames, in which the coding information
comprises a coding type of the video frames;

determining whether the coding type of a current frame is a first coding type or a second coding type;
evaluating single frame quality levels for individual frames in the sequence of frames according to the coding information
to obtain a single frame quality evaluation result, if it is determined that the coding information of the current frame is
the first coding type, wherein the evaluating, when the coding information of the current frame is the first coding type,
is based at least in part on a coding rate of the current frame, at least one intra-coded (I) frame constant, or a frame rate
parameter of the sequence of video frames;

delaying evaluating of the single frame quality levels until coding information of a reference frame for the second coding
type is received and analyzed, if it is determined that the coding information of the current frame is the second coding type,
wherein the evaluating, when the coding information of the current frame is the second coding type, is based at least in part
on a coding rate of the current frame, at least one predicted (P) frame constant when the current frame is a P frame, at least
one bidirectional (B) frame constant when the current frame is a B frame, or a frame rate parameter of the sequence of video
frames; and

evaluating a sequence quality level for the entire sequence of frames in accordance with the single frame quality levels.

US Pat. No. 9,344,041

POLAR AMPLIFICATION TRANSMITTER DISTORTION REDUCTION

SnapTrack, Inc., San Die...

1. A method of envelope tracking by an envelope tracking transceiver, the envelope tracking transceiver including a transmitter
including an envelope tracking amplification stage arranged to receive an input signal to be amplified and a power supply
voltage tracking the envelope of the input signal to be amplified, and a receiver being located with the transmitter and for
receiving a received signal, the method comprising:
generating an amplified signal for transmission at the output of the amplifier;
tuning the receiver to a frequency to reject the intended transmit signal of the transmitter;
generating a sequence of adjustment values during one or more periods;
generating a signal indicative of a characteristic of the received signal;
multiplying the signal indicative of the characteristic of the received signal and the generated sequence of adjustment values
for each of the periods;

generating an adjustment signal based on the multiplication;
and
adjusting a setting of the transmitter in dependence on the adjustment signal.

US Pat. No. 9,190,958

HIGH EFFICIENCY AMPLIFICATION

SNAPTRACK, INC., San Die...

1. A power supply stage, comprising:
a selection circuit for selecting one of a plurality of power supply voltages in dependence on a reference signal;
a delay circuit for generating a delayed reference signal;
an adjustment circuit for receiving the selected power supply voltage and the delayed reference signal and adapted to generate
an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage
and the delayed reference signal.

US Pat. No. 9,116,183

DYNAMIC CHARACTERISATION OF AMPLIFIER AM-PM DISTORTION

SNAPTRACK, INC., San Die...

9. A measurement system for determining an AM-PM distortion measurement for an amplifier, the measurement system being adapted
to:
generate a test waveform to be provided to the input of the amplifier;
periodically puncture the test waveform with a fixed-level reference signal to generate a modified test waveform which alternates
between test periods in which a portion of the test waveform is present and reference periods in which the fixed-level reference
signal is present;

measure the amplifier AM-PM distortion in a test period;
measure the phase difference between the input and the output of the amplifier in reference periods either side of the test
period;

estimate a phase error in the test period in dependence on phase differences measured in the reference periods; and
estimate the true amplifier AM-PM distortion by removing the estimated phase error from the measured amplifier AM-PM distortion.

US Pat. No. 9,496,832

PERFORMANCE OF OFF-CHIP CONNECTION FOR POWER AMPLIFIER

SnapTrack, Inc., San Die...

1. An amplifier arrangement provided on an integrated circuit, comprising:
a high pass filter configured to receive a first input signal and provide a high pass filtered version of the first input
signal;

a phase splitter configured to generate a second input signal and a third input signal, based on the first input signal, such
that the second and the third input signals have different phases;

a main amplifier configured to amplify the second and the third input signals having different phases to generate an output
of the main amplifier, wherein the main amplifier comprises a first push-pull amplifier and a second push-pull amplifier,
and wherein at least one output of the first push-pull amplifier and at least one output of the second push-pull amplifier
are combined to generate the output of the main amplifier; and

an additional amplifier configured to amplify the high pass filtered version of the first input signal to generate an output
of the additional amplifier, wherein the outputs of the main amplifier and the additional amplifier are combined to provide
an amplified output of the amplifier arrangement.

US Pat. No. 9,337,788

MULTI-STAGE AMPLIFIER

SnapTrack, Inc., San Die...

1. A method comprising:
providing a plurality of power supply voltages;
selecting, in a common switched voltage stage, one of the plurality of power supply voltages in dependence on a reference
signal representing a desired power supply voltage;

amplifying an input signal in a plurality of amplifiers;
distributing the one selected power supply voltage from the common switched voltage stage to a plurality of adjusting stages;
generating, in the plurality of adjusting stages, a plurality of adjusted selected power supply voltages, the number of the
adjusted selected power supply voltages corresponding to the number of amplifiers, each adjusted selected power supply voltage
tracking the reference signal in dependence on the one selected power supply voltage and the reference signal;

providing a plurality of copies of the reference signal for generating the plurality of adjusted selected power supply voltages,
wherein providing the plurality of copies of the reference signal comprises distributing the reference signal to each of the
plurality of adjusting stages using at least one splitter/buffer stage; and

providing each of the plurality of adjusted selected power supply voltages as the power supply voltage for a respective amplifier.

US Pat. No. 9,608,571

HIGH EFFICIENCY VARIABLE VOLTAGE SUPPLY

SNAPTRACK, INC., San Die...

1. A power supply for generating an output supply voltage, comprising:
a variable voltage supply configured to generate an intermediate supply voltage based on a reference signal;
a correction circuit configured to generate an error signal based on the output supply voltage or the intermediate supply
voltage; and

a combiner configured to combine the intermediate supply voltage and the error signal to provide the output supply voltage.

US Pat. No. 9,590,563

2G SUPPORT FOR 2G AND 3G/4G ENVELOPE TRACKING MODULATOR

SNAPTRACK, INC., San Die...

1. An amplification stage including an envelope tracking modulated supply for tracking a reference signal, comprising:
a low frequency path for tracking low frequency variations in the reference signal and for providing a first output voltage;
a full spectrum path for tracking the reference signal and for providing a second output voltage;
a combiner configured to combine the first and second output voltages to provide a third output voltage;
a first power amplifier configured to receive the first output voltage as a power supply voltage for the first power amplifier;
and

a second power amplifier configured to receive the third output voltage as a power supply voltage, for the second power amplifier.

US Pat. No. 9,338,216

METHOD, SYSTEM AND NETWORK DEVICE FOR IMPLEMENTING HTTP-BASED STREAMING SERVICE

SNAPTRACK, INC., San Die...

1. A method for implementing a Hyper Text Transfer Protocol-based streaming service, comprising:
receiving, by a server having a processor, a request from a client, and returning a response, to the client, that carries
a media presentation description file and carries a live play start time and a current time of the server;

receiving, by the server, a uniform resource locator from the client that was generated based on the live play start time
and the current time of the server, and obtaining a corresponding media fragment file;

returning the corresponding media fragment file to the client for playing on the client, wherein the uniform resource locator
is determined by the client, and is used by the client to request the corresponding media fragment file from the server, wherein
the media presentation description file comprises a uniform resource locator template to be used by the client to generate
the uniform resource locator corresponding to a media fragment to be played; and

receiving, by the server, a next uniform resource locator, the next uniform resource locator based on a file sequence number
that increases incrementally, the next uniform resource locator generated by the client, which replaces a variable in the
uniform resource locator template with the sequence number.

US Pat. No. 9,231,624

TIME ALIGNMENT FOR AN AMPLIFICATION STAGE

SNAPTRACK, INC., San Die...

11. A polar amplification stage including a main signal path to an amplifier input and a magnitude signal path to a supply
of an amplifier, the polar amplification stage further comprising:
a signal generator for generating signals for the main signal path and the magnitude signal path arranged to operate the amplifier
between a linear mode of operation and a saturated mode of operation;

a detector for detecting first and second peaks in a signal at an output of the amplifier representing transitions between
the linear and saturated modes of operation; and

a delay adjustment block for adjusting a timing in one of the main signal path and the magnitude signal path in dependence
on a relative difference between the size of the detected first and second peaks.

US Pat. No. 9,608,445

FILTER FOR SWITCHED MODE POWER SUPPLY

SnapTrack, Inc., San Die...

16. A modulated power supply including a filter for receiving a source voltage to be filtered and for providing an output
voltage, the filter comprising a resistive element and an inductor, wherein the resistive element is connected in parallel
across at least part of the inductor, and wherein the resistance of the resistive element reduces an output impedance of the
filter at a passband, a transition band, and a stop band of the filter as compared to the output impedance of the filter without
the resistance.

US Pat. No. 9,673,707

APPARATUS AND METHODS FOR BYPASSING AN INDUCTOR OF A VOLTAGE CONVERTER

SKYWORKS SOLUTIONS, INC.,...

1. A wireless device comprising:
a voltage converter configured to generate one or more converted voltages based on controlling a current through an inductor,
the inductor including a first end electrically connected to a first node and a second end electrically connected to a second
node; and

a bypass circuit that selectively bypasses the inductor based on a state of a bypass control signal, the bypass circuit including
a first p-type field effect transistor and a second p-type field effect transistor electrically connected in series between
the first node and the second node, the first p-type field effect transistor including a body electrically connected to a
first voltage, and the second p-type field effect transistor including a body electrically connected to a second voltage greater
than the first voltage.

US Pat. No. 9,628,025

RESONANCE SUPPRESSION FOR ENVELOPE TRACKING MODULATOR

SnapTrack, Inc., San Die...

1. An envelope tracking power supply arranged to generate a modulated supply voltage in dependence on a reference signal,
comprising:
a first path configured to track low frequency variations in the reference signal;
a second path configured to track high frequency variations in the reference signal;
a combiner configured to generate the modulated supply voltage based on the tracked low and high frequency variations, wherein
the combiner comprises a low pass combining element coupled between an output of the first path and an output node of the
combiner and a high pass combining element coupled between an output of the second path and the output node of the combiner,
wherein the low pass combining element comprises an inductor and the high pass combining element comprises a capacitor;

sensing circuitry configured to sense a resonance signal in the combine; and
adjusting circuitry configured to adjust a signal in the first path to control the resonance in dependence on the sensed signal.

US Pat. No. 9,500,853

MEMS-BASED DISPLAY APPARATUS

SnapTrack, Inc., San Die...

1. An apparatus comprising:
a substrate;
a layer of material arranged over a surface of the substrate and attached to the substrate, the layer of material including
an aperture; and

an electromechanical light modulator arranged between the layer of material and the substrate and aligned with the aperture,
the electromechanical light modulator including a movable shutter, a first beam attached to the movable shutter, a second
beam supported over the substrate, and

wherein the first beam and the second beam are configured such that, in response to an application of a voltage across the
first and second beams, the first beam is drawn toward the second beam causing the movable shutter to move in a plane of motion
which is substantially parallel to the layer of material.

US Pat. No. 9,530,344

CIRCUITS FOR CONTROLLING DISPLAY APPARATUS

SnapTrack, Inc., San Die...

1. A display comprising:
an array of pixels, each of the pixels having a corresponding light blocking element;
one or more light sources to direct light toward the pixels to form an image on the display; and
a controller circuit capable of providing data to:
actuate the light blocking elements during a first update phase comprising a first sub-phase corresponding to a first transition
of a light blocking element and a second sub-phase corresponding to a second transition of the light blocking element,

illuminate one or more of the light sources during a first lamp illumination phase, and
load image data to the array of pixels during a first data loading phase, wherein:
the first update phase overlaps at least partially in time with the first lamp illumination phase, and
the image data is loaded during at least a portion of the first sub-phase of the first update phase.

US Pat. No. 9,859,854

POWER AMPLIFIER WITH STABILISING NETWORK

SnapTrack, Inc., San Die...

1. A circuit comprising:
an amplifier;
an envelope modulated power supply configured to provide a modulated power supply voltage to the amplifier;
a first inductive element having a first terminal coupled to an output of the envelope modulated power supply and a second
terminal coupled to an output of the amplifier via a node;

a radio frequency (RF) matching network connected between the output of the amplifier and an output of the circuit;
a resonant damping network including a resistive element, the resonant damping network connected to the node between the output
of the amplifier and the second terminal of the first inductive element; and

a reactive element connected in series with the resistive element, wherein the reactive element comprises a second inductive
element in series with a capacitive element,

wherein the resonant damping network further comprises another capacitive element in parallel with a third inductive element,
wherein the other capacitive element is in series with the second inductive element.

US Pat. No. 9,793,858

TRANSFER FUNCTION REGULATION

SnapTrack, Inc., San Die...

1. A method for controlling in an envelope tracking amplification stage comprising an amplifier, the method comprising:
determining a representation of an output signal of the amplifier;
determining a representation of an input signal of the amplifier;
adjusting the determined representation of the input signal according to a target characteristic of the amplifier;
comparing the adjusted representation of the input signal and the determined representation of the output signal; and
generating a control signal based on the comparison,
wherein at least one of:
the target characteristic is an AM-AM characteristic, the control signal is an amplitude control signal, and the control signal
modifies a shaping function applied to an envelope of the input signal, or

the target characteristic is a PM-PM characteristic, the control signal is a phase control signal, and the control signal
modifies a phase of the input signal.

US Pat. No. 9,723,332

METHOD, SYSTEM AND APPARATUS FOR EVALUATING VIDEO QUALITY

SnapTrack, Inc., San Die...

1. A method for evaluating video quality, comprising:
obtaining information about a transmitted video;
resolving the information about the transmitted video to obtain video frame parameters comprising a compression distortion
parameter and a video quality distortion parameter with packet loss, the video quality distortion parameter based at least
in part on a first video quality distortion parameter based on a percentage of invalid packets and a second video quality
distortion parameter based on frame quality deterioration caused by propagation of errors related to time domain activity
that is based on a code rate; and

calculating a video frame quality parameter on a per frame basis according to the video frame parameters.

US Pat. No. 9,607,576

HYBRID SCALAR-VECTOR DITHERING DISPLAY METHODS AND APPARATUS

SnapTrack, Inc., San Die...

1. An apparatus, comprising
a display that includes an array of display elements;
a processor capable of communicating with the display, the processor being capable of processing image data;
a memory device capable of communicating with the processor; and
a controller configured to:
receive an input image frame;
generate a first set of color subfields based on the received input image frame;
process the first set of color subfields to obtain a second set of color subfields, the second set of color subfields including
a larger number of color subfields than the first set of color subfields;

execute a scalar dithering process on at least one color subfield of the second set of color subfields using a first dither
mask;

execute a vector dithering process across at least two color subfields of the second set of color subfields using a second
dither mask; and

cause the dithered second set of color subfields to be output on a display.

US Pat. No. 9,524,092

DISPLAY MODE SELECTION ACCORDING TO A USER PROFILE OR A HIERARCHY OF CRITERIA

SnapTrack, Inc., San Die...

1. A method of customizing display settings of a mobile display device, comprising:
controlling the mobile display device to provide at least one prompt for preference data, including at least one prompt for
a selection among multiple scenarios involving trade-offs between display parameter settings and corresponding power consumption
levels;

receiving the preference data via the mobile display device;
adding the preference data to a profile; and
controlling a display of the mobile display device, at least in part, according to the profile, wherein the display parameter
settings include color depth settings, each of the color depth settings corresponding to a number of bits used to specify
a color depth setting.

US Pat. No. 9,858,845

DISPLAY INCORPORATING DYNAMIC SATURATION COMPENSATING GAMUT MAPPING

SnapTrack, Inc., San Die...

1. An apparatus comprising:
an array of display elements;
control logic configured to:
receive an input image frame, wherein the input image frame includes, for each of a plurality a pixels, a first set of color
parameter values;

apply a content adaptive gamut mapping process to the first set of color parameter values associated with the pixel to map
the first set of color parameter values to a second set of color parameter values, wherein the content adaptive gamut mapping
process is based at least in part on the content of the image frame;

determine a saturation level parameter for the input image frame and adapt the gamut mapping process based on the determined
saturation parameter of the input image frame, wherein the control logic is further configured to adapt the gamut mapping
process by generating an image saturation level-dependent gamut mapping lookup table by interpolating between at least two
stored gamut mapping lookup tables based on the determined image saturation parameter; and

decompose the second set of color parameter values associated with the pixel to obtain pixel intensity values in respective
color subfields associated with at least four different colors;

generate display element state information for the display elements based on the color subfields; and
output the display element state information associated with the at least four color subfields to the array of display elements.

US Pat. No. 9,823,411

ETENDUE-PRESERVING LIGHT COUPLING SYSTEM HAVING LIGHT OUTPUT APERTURE SMALLER THAN LIGHT INPUT APERTURE

SnapTrack Inc., San Dieg...

21. A method of manufacturing an optical system, the method comprising:
providing an optical coupling system including:
a light input surface configured to receive incident light through an input aperture; and
a light output surface configured to emit the incident light through an output aperture having an area smaller than an area
of the input aperture,

wherein the optical coupling system is configured to couple to an optical source separated from the light input surface by
a gap, the gap including a medium having lower refractive index than the refractive index of material forming the optical
coupling system; and

providing an optical receiving system optically coupled to the light output surface of the optical coupling system, the optical
receiving system including:

a light redirecting element configured to receive light from the light output surface of the optical coupling system along
an incident direction and redirect the light along an output direction that is at an angle with respect to the incident direction;
and

a light guide configured to internally propagate the redirected light,
wherein a material of the optical receiving system optically coupling with the output aperture has substantially the same
refractive index as material of the optical coupling system, and

wherein the optical coupling system is configured to preserve etendue of the light emitted from the output surface relative
to the etendue of light incident on the input surface of the optical coupling system.

US Pat. No. 9,641,150

ELECTRICAL COMPONENT

SNAPTRACK, INC., San Die...

1. An electrical component comprising:
a substrate having a rectangular bottom surface and an opposite rectangular top surface;
a first filter implemented in or mounted on the substrate;
a second filter implemented in or mounted on the substrate;
a common signal connection, both the first and second filters being connected in parallel to the common signal connection;
a first filter connection at the first filter;
a second filter connection at the second filter, wherein the common signal connection and the first and second filter connections
are disposed on the bottom surface of the substrate and are each assigned one or more terminal surfaces, wherein the common
signal connection, the first filter connection, and the second filter connection implement respective component connections;
and

a plurality of ground terminal surfaces disposed on the bottom surface of the substrate;
wherein altogether at least seven terminal surfaces from the one or more terminal surfaces and the plurality of ground terminal
surfaces are disposed near edges of the rectangular substrate; and

wherein at least one of the plurality of ground terminal surfaces is disposed in a corner of the rectangular bottom surface
and is further away from a terminal surface of the one or more terminal surfaces assigned to the common signal connection
than a terminal surface of the one or more terminal surfaces assigned to the first and the second filter connections,

wherein the one or more terminal surfaces of at least one of the first and the second filter connections comprises a pair
of terminal surfaces balanced to each other with respect to ground, that are at different distances from the common signal
connection and are disposed on the rectangular bottom surface, and

wherein the respective terminal surface of the corresponding pair of terminal surfaces that is disposed closer to the common
signal connection comprises a smaller surface area than the other terminal surface of the pair of terminal surfaces.

US Pat. No. 9,761,732

TUNNEL THIN FILM TRANSISTOR WITH HETERO-JUNCTION STRUCTURE

SnapTrack Inc., San Dieg...

1. An apparatus comprising a thin film transistor (TFT), the TFT comprising:
a source electrode;
a drain electrode;
a first semiconductor layer connecting the source electrode and the drain electrode, the first semiconductor layer including
a source region, a channel region and a drain region; and

a source-side p-n heterojunction between the source electrode and the source region of the first semiconductor layer, wherein
the source side p-n hetero-junction is not on the drain region side of the TFT transistor, and wherein the first semiconductor
layer includes an oxide, sulfide, selenide or nitride semiconductor material.

US Pat. No. 9,651,735

OPTICAL FIBER ARRAY FOR ACHIEVING CONSTANT COLOR OFF-AXIS VIEWING

SnapTrack, Inc., San Die...

1. An apparatus, comprising:
a display;
a substantially transparent substrate;
an array of optical fibers disposed between the substrate and the display, the array of optical fibers being capable of transmitting
light between the substrate and the display, the array of optical fibers including optical fibers having substantially random
lengths; and

a source of substantially incoherent light capable of illuminating the array of optical fibers, wherein light emerging from
a first fiber in the array and light emerging from a second fiber in the array are mutually incoherent.

US Pat. No. 9,647,135

TIN BASED P-TYPE OXIDE SEMICONDUCTOR AND THIN FILM TRANSISTOR APPLICATIONS

SNAPTRACK, INC., San Die...

1. An apparatus comprising a thin film transistor (TFT), the TFT comprising:
a source electrode;
a drain electrode; and
a semiconductor channel connecting the source electrode and the drain electrode, the semiconductor channel including a ternary
or higher order tin-based (Sn-based) p-type oxide, wherein the ternary or higher order Sn-based p-type oxide comprises Sn
(II).

US Pat. No. 9,647,196

WAFER-LEVEL PACKAGE AND METHOD FOR PRODUCTION THEREOF

SNAPTRACK, INC., San Die...

1. A wafer-level package for an electrical component comprising:
a first piezoelectric wafer comprising first component structures on a first surface;
a second piezoelectric wafer comprising second component structures;
a metallic frame structure connected to the first surface of the first wafer and a first surface of the second wafer such
that a hermetically sealed cavity enclosed by the frame structure is formed between the first and second wafers;

electrical connections on a second surface of the second wafer that faces away from the cavity;
pillar-type electrical connections supported within the cavity on the first and second wafers and electrically connected to
the first component structures and/or the second component structures;

contact pads within the cavity on the first surface of the first wafer and the first surface of the second wafer;
an irregular pattern of pillars arranged on a second surface of the first wafer, the second surface of the first wafer facing
away from the first surface of the first wafer, wherein the irregular pattern of pillars is configured to dampen acoustic
waves; and

a shielding layer formed over the pillars,
wherein the first component structures and the second component structures are enclosed within the cavity and are connected
to the electrical connections via plated through-holes through the second wafer,

wherein all the plated through-holes end either on the frame structure, on a pillar connection or on a contact pad, without
violating a hermeticity of the cavity,

wherein the frame structure, the pillar connections and the contact pads substantially consist of copper,
wherein the first component structures operate with surface acoustic waves and are embodied as an SAW filter, and
wherein the second component structures comprise transducers for surface acoustic waves and/or passive components selected
from inductances and capacitances.

US Pat. No. 9,628,024

ENVELOPE TRACKING MODULATOR WITH FEEDBACK

SnapTrack, Inc., San Die...

1. An envelope tracking modulated supply arranged to generate a modulated supply voltage in dependence on a reference signal,
comprising:
a low frequency path configured to receive the reference signal and track low frequency variations in the reference signal
and including a switched mode power supply;

a correction path configured to track high frequency variations in the reference signal and including a linear amplifier,
a feedback path coupled between an output of the linear amplifier and an input of the linear amplifier, and a voltage source
for providing an offset voltage in the reference signal in the correction path, wherein the voltage source is coupled to the
input of the linear amplifier; and

a combiner configured to combine an output of the low frequency path and an output of the correction path to generate the
modulated supply voltage.

US Pat. No. 9,583,035

DISPLAY INCORPORATING LOSSY DYNAMIC SATURATION COMPENSATING GAMUT MAPPING

SnapTrack, Inc., San Die...

1. An apparatus comprising:
an array of display elements;
control logic configured to:
receive an input image frame, wherein the input image frame includes, for each of a plurality of pixels, a first set of color
parameter values;

generate an output image frame by:
obtaining a gamut mapping saturation parameter;
for each pixel in the received image frame, using the gamut mapping saturation parameter, applying a content adaptive gamut
mapping process to the first set of color parameter values associated with the pixel to map the first set of color parameter
values to a second set of color parameter values;

decomposing the second set of color parameter values associated with the plurality of pixels to form pixel intensity values
in respective color subfields associated with at least four different colors; and

generating display element state information for the display elements based on the color subfields;
output the output image frame to the array of display elements;
determine a color difference between the output image frame and a reference output image frame; and
update the gamut mapping saturation parameter based on the determined color difference.

US Pat. No. 9,835,676

DYNAMIC CHARACTERISATION OF AMPLIFIER USING MULTIPLE ENVELOPE SHAPING FUNCTIONS

SnapTrack, Inc., San Die...

1. A method of characterizing an envelope tracking amplification stage comprising an amplifier for amplifying an input signal
and an envelope tracking modulated power supply for generating a modulated supply voltage for the amplifier in dependence
on an envelope of the input signal, wherein the envelope of the input signal supplied to the envelope tracking modulated power
supply is shaped by a shaping function, the method comprising:
generating an input test waveform which is representative of an input waveform under normal operating conditions of the amplification
stage;

applying a respective one of a plurality of different shaping functions, each comprising a non-linear transfer function, to
the envelope of the input signal in each of a plurality of test periods during a period in which the input test waveform is
applied as the input signal to generate an input to the envelope tracking modulated power supply;

measuring parameters of the amplification stage during the period in which the input test waveform is applied in order to
allow determination of gain, phase, and efficiency characteristics of the amplifier; and

for each of the gain, phase, and efficiency characteristics, generating a three-dimensional plot of the characteristic with
respect to an input power and the modulated supply voltage applied to the amplifier.

US Pat. No. 9,818,336

VECTOR DITHERING FOR DISPLAYS EMPLOYING SUBFIELDS HAVING UNEVENLY SPACED GRAY SCALE VALUES

SnapTrack Inc., San Dieg...

1. A controller comprising:
input logic configured to receive an input image frame;
subfield derivation logic configured to:
derive a plurality of initial color subfields based on the received image frame, wherein each of the initial color subfields
includes a respective intensity value for each pixel of the display for a corresponding color;

apply a vector dithering process across the initial color subfields by:
deriving a plurality of quantized color subfields, each quantized color subfield corresponding to one of the initial color
subfields, wherein for at least one of the quantized color subfields, the controller quantizes the intensity values to an
unevenly spaced set of available intensity values; and

deriving a plurality of final color subfields based on the quantized color subfields, the uneven spacing of available intensity
values in the at least one quantized color subfield, and a dither map; and

output logic configured to cause the final color subfields to be output on a display.

US Pat. No. 9,811,923

STOCHASTIC TEMPORAL DITHERING FOR COLOR DISPLAY DEVICES

SnapTrack, Inc., San Die...

1. An apparatus comprising:
a display device including a plurality of display elements, each display element capable of displaying N primary colors in
a color space associated with the display device, wherein N is a positive number greater than 2; and

a computing device capable of communicating with the display device, the computing device capable of processing image data
that includes a plurality of input colors for display by the display device, the image data including a plurality of image
pixels with each image pixel associated with an input image pixel color, wherein the computing device is further capable of:

for a given image pixel:
identifying, from a color palette including colors capable of being displayed by temporal dithering of the N primary colors
in K number of temporal sub-frames, L number of colors that can be combined by spatio-temporal dithering to produce a color
that is perceptually similar to the input image pixel color, wherein K is a positive number greater than or equal to 2, and
L is a positive number greater than 2;

associating a stochastic screen with the display device or a portion thereof, the stochastic screen including a plurality
of screen elements belonging to one of M number of partitions and each of the plurality of screen elements associated with
a corresponding display element of the display device, wherein M is a positive number greater than or equal to 2; and

for each of the K number of temporal sub-frames,
assigning one of the L number of colors to a display element of the display device that corresponds to the image pixel, and
displaying an image produced by a respective one of the K number of temporal sub-frames,
wherein the assignment of one of the L number of colors to the display element in each of the K number of temporal sub-frames
is based on a rank order and a partition index of a screen element of the stochastic screen that is associated with the display
element,

wherein the stochastic screen is configured such that visual appearance of the image produced by each of the K number of temporal
sub-frames is similar to an image produced by combining the K number of temporal sub-frames.

US Pat. No. 9,632,307

MEMS SHUTTER ASSEMBLIES FOR HIGH-RESOLUTION DISPLAYS

SNAPTRACK, INC., San Die...

1. An apparatus, comprising:
a substrate; and
an electromechanical systems (EMS) display element supported over the substrate, the EMS display element including:
an electrostatic actuator including:
a first beam electrode coupled to a first anchor;
a second beam electrode coupled to a second anchor,
wherein, the first and second anchors support the first and second beam electrodes over the substrate such that at least one
of the first and second beam electrodes deforms towards the other in response to the application of a voltage across the first
and second beam electrodes; and

a shutter, including a conductive sidewall, and having a proximal level substantially parallel to the substrate and a distal
level substantially parallel to the substrate, the distal level spaced from the substrate by a greater distance than the proximal
level is spaced from the substrate, wherein the conductive sidewall comprises a majority of the second beam electrode and
connects the proximal and distal levels, and wherein each of the proximal and distal levels couples to, and extends away from,
the conductive sidewall, and wherein the shutter includes a perimeter edge and the conductive sidewall of the shutter is positioned
within a projection of the perimeter edge of the shutter onto the substrate such that upon actuation of the electrostatic
actuator, the perimeter edge of the shutter passes over or under at least a portion of the first beam electrode.

US Pat. No. 9,774,306

POWER AMPLIFIER WITH STABILISING NETWORK

SnapTrack, Inc., San Die...

1. A circuit comprising:
an amplifier;
an envelope modulated power supply configured to provide a modulated power supply voltage to the amplifier;
a first inductive element having a first terminal coupled to an output of the envelope modulated power supply and a second
terminal coupled to an output of the amplifier via a node;

a radio frequency (RF) matching network connected between the output of the amplifier and an output of the circuit;
a resonant damping network including a resistive element, the resonant damping network connected to the node between the output
of the amplifier and the second terminal of the first inductive element; and

a reactive element connected in series with the resistive element, wherein the reactive element comprises a second inductive
element in series with a capacitive element,

wherein the resonant damping network further comprises another capacitive element in parallel with a third inductive element,
wherein the other capacitive element is in series with the second inductive element.

US Pat. No. 9,647,637

SAW FILTER WITH IMPROVED STOP BAND SUPPRESSION

SNAPTRACK, INC., San Die...

1. A filter working with surface acoustic waves comprising:
a piezoelectric substrate (SU) providing an acoustic track on the surface of the substrate;
a first transducer (IDT1) arranged in the acoustic track coupled to an input, having a first mean finger period (p1) assigned to a centre frequency of a pass band of the filter;

a second transducer (IDT2) arranged in the acoustic track coupled to an output, having the same first mean finger period (p1);

a reflector arranged between the first and second transducers having a second mean finger period (p2) assigned to a stop band frequency different from the centre frequency,

wherein the first and second transducers (IDT1,IDT2) are fan type transducers,

wherein a width of each transducer finger and a spacing between the fingers of a respective pair of adjacent transducer fingers
are increasing in a transversal direction, the transversal direction being normal to a longitudinal direction of the acoustic
track but within the substrate plane, the transducers being adapted to provide a relative bandwidth of the transducer of at
least 8%, and

wherein both the transducers (IDT1,IDT2) comprise Single Phase Uni-Directional Transducer (SPUDT) cells such that an acoustic wave is propagated towards a preferred
direction; and

a shielding structure (SH) between the first and second transducers (IDT1,IDT2) minimizing the free surface between the first transducer (IDT1), the reflector (REF) and the second transducer (IDT2), the shielding structure (SH) being a fully metalized area or comprising a non-reflective finger grating.

US Pat. No. 9,859,868

BAW-FILTER OPERATING USING BULK ACOUSTIC WAVES AND PASSIVE COMPONENTS FORMING A BALUN

SnapTrack, Inc., San Die...

1. A bulk acoustic wave (BAW) filter, comprising:
a multilayer construction,
wherein functional layers of a single BAW resonator operating with bulk acoustic waves are realized by the multilayer construction,
and

wherein an interconnection of passive components is furthermore formed by the multilayer construction, said interconnection
forming a balun, wherein the balun has at least one inductance and at least one capacitance which are formed from structured
functional layers of the single BAW resonator, and wherein structured metal layers which form the inductance and structured
metal layers which form the capacitance are arranged at least partly one above another.

US Pat. No. 9,818,347

DISPLAY APPARATUS INCLUDING SELF-TUNING CIRCUITS FOR CONTROLLING LIGHT MODULATORS

SnapTrack, Inc., San Die...

1. A display apparatus, comprising:
a plurality of light modulators capable of selectively allowing passage of light;
a plurality of pixel circuits, each pixel circuit including:
an output node coupled to a corresponding light modulator of the plurality of light modulators,
a charge transistor configured to charge the output node from an actuation interconnect, and
a discharge transistor configured to selectively conduct a current between the output node and an update interconnect;
an update interconnect driver configured to output voltages to the update interconnects of the plurality of pixel circuits;
and

a controller coupled to the plurality of pixel circuits configured to:
determine a low update voltage to apply to the update interconnects by:
causing the charge transistors of the plurality of pixel circuits to enter a conductive state, and
while the charge transistors of the plurality of pixel circuits are in the conductive state, determining a plurality of voltage
levels provided to the update interconnects that cause the discharge transistor of at least one of the plurality of pixel
circuits to conduct current.

US Pat. No. 9,866,261

RF ANTENNA SWITCH AND METHOD OF OPERATING THE ANTENNA SWITCH

SnapTrack, Inc., San Die...

1. An apparatus comprising:
an antenna terminal;
a switch comprising a number of n I/O terminals; and
n?x transceiver units, wherein each transceiver unit is configured to operate in a frequency band of a respective communication
system, and wherein n and x are integers and n, x?1 and n>x,

wherein the switch is adapted to independently connect a plurality of the I/O terminals to the antenna terminal to provide
respective signal paths from the antenna terminal to the I/O terminals,

wherein a filter is connected between a first I/O terminal of the I/O terminals and a common input node of a first transceiver
unit of the transceiver units, the filter being adapted to filter out an unwanted harmonic mode produced by a transmitter
of the first transceiver unit, and

wherein the common input node of the first transceiver unit is connected to a second I/O terminal of the I/O terminals.

US Pat. No. 9,722,543

POWER SUPPLY STAGE

SnapTrack, Inc., San Die...

1. A method of generating a power supply voltage tracking a reference signal, comprising:
generating a plurality of filtered reference signals by filtering the reference signal such that the filtered reference signals
each have different bandwidths, wherein filtering the reference signal comprises:

filtering the reference signal with a first filter bandwidth to provide a first filtered reference signal;
filtering the reference signal with a second filter bandwidth to provide a second filtered reference signal; and
filtering the reference signal with n-2 further filter bandwidths to provide n-2 further filtered reference signals, wherein
a total number of filtered reference signals is n;

generating a first voltage in dependence on the plurality of filtered reference signals, wherein the plurality of filtered
reference signals comprises the first and the second filtered reference signals;

generating n-2 further voltages in dependence on the n-2 further filtered reference signals, wherein a total number of generated
voltages is n;

combining the n-2 further voltages with the generated first voltage by combining each of the n-2 further voltages in cascaded
stages, wherein for an ith stage, where i=3 to n, an ith generated voltage is combined with a combined voltage of an i-1th stage to provide a modified power supply voltage, an output of the nth stage forming the first voltage;

generating a second voltage in dependence on the reference signal; and
combining the first and second voltages to provide the power supply voltage.

US Pat. No. 9,634,612

EFFICIENCY FOR LINEAR AMPLIFIER OF ENVELOPE TRACKING MODULATOR

SnapTrack, Inc., San Die...

1. An envelope tracking power supply arranged to generate a modulated supply voltage in dependence on a reference signal,
comprising:
a first path for tracking low frequency variations in the reference signal; and
a second path for tracking high frequency variations in the reference signal, wherein the second path comprises:
a linear amplifier having an output stage coupled to an output node, wherein the output stage comprises a current source and
a current sink, wherein the current source is coupled between the output node and a first voltage supply and the current sink
is coupled between the output node and electrical ground;

a switch mode converter configured to generate a second voltage supply to generate a DC offset current based on a power difference
between a power associated with the current sink and a power associated with the current source; and

an inductor, coupled between the second voltage supply and the output node, for providing the DC offset current at the output
node.

US Pat. No. 9,948,241

APPARATUS AND METHODS FOR REDUCING INDUCTOR RINGING OF A VOLTAGE CONVERTER

SKYWORKS SOLUTIONS, INC.,...

1. A voltage converter comprising:an inductor connected between a first node and a second node;
a plurality of switches including a first switch connected between a battery voltage and the first node, a second switch connected between the first node and a ground voltage, a third switch connected between the second node and the ground voltage, and a fourth switch connected between the second node and the output; and
a bypass circuit having an activated state and a deactivated state, the bypass circuit including a first pair of transistors connected between the first node and the second node and configured to turn on to bypass the inductor in the activated state and to turn off in the deactivated state.

US Pat. No. 9,704,441

SYSTEM AND METHOD TO ADJUST DISPLAYED PRIMARY COLORS BASED ON ILLUMINATION

SnapTrack, Inc., San Die...

9. A method of displaying image data on a display device including at least one display element, the at least one display
element configured to display a first set of at least four adjustable primary colors in a color space associated with the
display device when under illumination by light from a first illumination source, the first illumination source being ambient
light, the at least four adjustable primary colors associated with at least four different values of a device parameter of
the at least one display element that can be adjusted to provide the first set of at least four adjustable primary colors,
the method comprising:
under control of an electronic processing circuit associated with the display device:
detecting a change in the nature of the illumination when the at least one display element is illuminated by light from at
least a front light source associated with the display device; and

adjusting at least some of the at least four different values of the device parameter such that the display element is configured
to display a second set of at least four adjustable primary colors in the color space associated with the display device when
illuminated by light from at least the front light source,

wherein the second set of at least four adjustable primary colors displayed by the display element when illuminated by light
from at least the front light source is perceptually similar to the first set of at least four adjustable primary colors when
illuminated by light from the first illumination source.

US Pat. No. 10,154,582

METHOD FOR PRODUCING A CASED ELECTRICAL COMPONENT

SnapTrack, Inc., San Die...

1. A method for producing a cased electrical component, comprising:arranging a spring device on a carrier substrate;
arranging a bearing element on the carrier substrate;
arranging a chip on the spring device and the bearing element in such a way that a first side of the chip is coupled to the spring device and the first side of the chip at least partly bears on the bearing element; and
arranging a covering element over the chip in such a way that the covering element touches the chip at least at a second side of the chip, the second side being different from the first side, wherein the covering element has a first layer and a second layer arranged on the first layer, wherein the first layer of the covering element has a section touching the bearing element with a cutout, and wherein the second layer of the covering element is contact-connected to the bearing element through the cutout.

US Pat. No. 9,837,214

CAPACITOR HAVING AN IMPROVED LINEAR BEHAVIOR

SnapTrack, Inc., San Die...

1. An apparatus comprising:
a bulk acoustic wave (BAW) resonator stack comprising a first electrode, a second upper electrode, a lower electrode, and
a piezoelectric layer disposed between the first upper electrode and the lower electrode;

a mirror structure disposed below the lower electrode of the BAW resonator stack and comprising a dielectric layer, wherein
the dielectric layer is not piezoelectric; and

a capacitor electrically connected to the BAW resonator stack and comprising:
first and second electrically conductive layers, wherein the dielectric layer of the mirror structure is disposed between
the first and second electrically conductive layers;

a first electrode and a second electrode disposed in the first electrically conductive layer; and
a third electrode disposed in the second electrically conductive layer, wherein:
a portion of the first electrode and a portion of the second electrode each overlap with at least a portion of the third electrode;
the first electrode and the second electrode are terminal electrodes of the capacitor;
the first electrode and the lower electrode are the same electrode; and
the second electrode of the capacitor is connected to the second upper electrode through the piezoelectric layer.

US Pat. No. 9,831,851

BAW COMPONENT, LAMINATION FOR A BAW COMPONENT, AND METHOD FOR MANUFACTURING A BAW COMPONENT

SnapTrack, Inc., San Die...

1. A BAW component, comprising:
a first bulk acoustic wave (BAW) resonator having a first bottom electrode, a first top electrode and a lamination between
the first bottom electrode and the first top electrode, wherein:

the lamination comprises a first layer with a first piezoelectric material comprising Sc doped AlN and a second layer with
a second piezoelectric material that is different from the first piezoelectric material and arranged over the first layer;

a carrier chip; and
a second BAW resonator consisting of a second bottom electrode, a second top electrode, and a piezoelectric layer between
the second bottom electrode and the second top electrode, wherein:

the first BAW resonator and the second BAW resonator are arranged on the carrier chip; and
the piezoelectric layer is a layer of the first piezoelectric material, substantially free of the second piezoelectric material.

US Pat. No. 10,075,134

DELAY ADJUSTMENT

SNAPTRACK, INC., San Die...

1. An envelope tracking amplification stage comprising:an input path;
an envelope path; and
a delay stage in one of the input path and the envelope path, a delay of the delay stage being determined in dependence on a slope polarity of a signal representing an input signal and whether a signal in the input path leads or lags a signal in the envelope path.

US Pat. No. 9,788,138

METHODS AND SYSTEMS OF ALLOCATING APPLICATION FUNCTIONS TO MOTION-CORRELATED DEVICES

SnapTrack, Inc., San Die...

1. A method of allocating application functions to two or more mobile devices, comprising:
determining, by a processor, whether a first motion of a first mobile device and a second motion of a second mobile device
are correlated, within one of two or more correlation tiers by: and

comparing the first and second motions to two or more threshold; and
identifying a correlation tier within the one of the two or more correlation tiers based on the comparison of the first and
second motions to the two or more thresholds; and

allocating, by the processor, a first application function to the first mobile device and a second application function to
the second mobile device in response to determining that the first motion and the second motion are correlated.

US Pat. No. 10,193,523

FILTER CHIP AND METHOD FOR PRODUCING A FILTER CHIP

SnapTrack, Inc., San Die...

1. A filter chip,comprising an interconnection of at least one first and one second resonator operating with bulk acoustic waves,
wherein the first resonator operating with bulk acoustic waves comprises a first piezoelectric layer that is structured in such a way that the first resonator has a lower resonant frequency than the second resonator,
wherein the first piezoelectric layer forms a phononic bandgap structure.

US Pat. No. 9,715,102

ELECTROMECHANICAL SYSTEMS DEVICE WITH HINGES FOR REDUCING TILT INSTABILITY

SnapTrack, Inc., San Die...

1. An electromechanical systems (EMS) device comprising:
a substrate;
a stationary electrode on the substrate;
a movable mirror over the stationary electrode and configured to move across a first gap by electrostatic actuation between
the movable mirror and the stationary electrode;

a plurality of first anchor points equally spaced apart and arranged about the center of the movable mirror, the first anchor
points providing connection of the EMS device at the substrate;

a plurality of second anchor points equally spaced apart and arranged about the center of the movable mirror, the second anchor
points providing connection of the EMS device at the movable mirror, each of the first anchor points corresponding to at least
one of the second anchor points to define a plurality of paired first and second anchor points; and

a plurality of hinges, each positioned between a distinct one of the plurality of paired first and second anchor points, the
plurality of hinges connected to the movable mirror and symmetrically arranged about the center of the EMS device, wherein
the movable mirror has a front surface facing the substrate and a back surface opposite the front surface, the plurality of
hinges suspended over and connected to the back surface of the movable mirror at the plurality of second anchor points.

US Pat. No. 9,979,353

HIGH EFFICIENCY VARIABLE VOLTAGE SUPPLY

SnapTrack, Inc., San Die...

1. A power supply for generating an output supply voltage, comprising:a variable voltage supply configured to generate an intermediate supply voltage based on a reference signal;
a correction circuit configured to generate an error signal based on the reference signal and the output supply voltage or the intermediate supply voltage; and
a combiner configured to generate the output supply voltage by combining the intermediate supply voltage and the error signal.

US Pat. No. 9,948,327

FRONT END CIRCUIT AND METHOD OF OPERATING A FRONT END CIRCUIT

SnapTrack, Inc., San Die...

1. A front end circuit, comprising:a first tunable duplexer comprising a first tunable RX bandpass filter and a first tunable TX bandpass filter; and
a second tunable duplexer comprising a second tunable RX bandpass filter and a second tunable TX bandpass filter,
wherein the first tunable duplexer is configured to support a first FDD mode in a first FDD frequency band and a first TDD mode in a first TDD frequency band,
wherein the front end circuit is configured to support a TDD interband carrier aggregation mode wherein a signal is received simultaneously in the first TDD frequency band and in an aggregated TDD frequency band, and
wherein the second tunable RX bandpass filter is tuned to the aggregated TDD frequency band in the TDD interband carrier aggregation mode.

US Pat. No. 9,819,309

OUTPUT STAGE FOR CLASS AB AMPLIFIER

SnapTrack, Inc., San Die...

1. A class AB amplifier for receiving an input current and generating an amplified output current and having first, second,
third, and fourth output transistors connected to provide the output current, wherein the first and third output transistors
are configured to be enabled and the second and fourth output transistors are configured to be disabled when the input current
is less than a threshold, and the second and fourth output transistors are configured to be enabled when the input current
exceeds the threshold, and wherein the second output transistor is physically larger than the first output transistor.

US Pat. No. 10,049,812

CIRCUIT ARRANGEMENT

SnapTrack, Inc., San Die...

1. A circuit comprising:a first conductor loop comprising a main loop and an opposite curvature loop, wherein the first conductor loop comprises a continuous trace forming the main loop and the opposite curvature loop; and
a further element, wherein:
the opposite curvature loop has a sense of curvature that is opposite to a sense of curvature of the main loop;
the opposite curvature loop reduces a coupling between the main loop and the further element; and
the circuit comprises an electroacoustic component, wherein the first conductor loop adapts acoustic properties of the circuit.

US Pat. No. 10,033,350

TUNABLE DUPLEXER HAVING A CIRCULATOR

SnapTrack, Inc., San Die...

1. A tunable duplexer comprising:a transmission port;
a reception port;
a common port;
a core having a first inductive element and a second inductive element;
a first signal path electrically connecting the transmission port to the core;
a second signal path electrically connecting the reception port to the core;
a third signal path electrically connecting the common port to the core;
a first tunable capacitive element that electrically connects the first signal path to electric ground;
a second tunable capacitive element that electrically connects the second signal path to the electric ground, wherein the first inductive element and the second inductive element are inductively and conductively coupled to one another;
a first inductor-capacitor (LC) parallel circuit that electrically connects the first signal path to the electric ground;
a second LC parallel circuit that electrically connects the second signal path to the electric ground; and
a third LC parallel circuit that electrically connects the third signal path to the electric ground.

US Pat. No. 9,853,204

MEMS COMPONENT AND METHOD FOR ENCAPSULATING MEMS COMPONENTS

SnapTrack, Inc., San Die...

1. A Microelectromechanical Systems (MEMS) component comprising:
a substrate having an active surface, wherein electrical component structures and contact areas for making electrical contact
with the electrical component structures are arranged on the substrate;

metallic column structures located on the contact areas and projecting beyond the electrical component structures;
a metallic frame structure arranged on the active surface of the substrate and enclosing the electrical component structures
together with the metallic column structures;

a resist layer seated on the metallic frame structure and the metallic column structures such that the substrate, the metallic
frame structure and the resist layer form an enclosed cavity, wherein at least one portion of selected metallic column structures
and the metallic frame structure penetrates through the resist layer to an extent such that those surfaces of the metallic
column structures that face away from the substrate are not covered by the resist layer; and

a structured metallization arranged over a surface of the resist layer that faces away from the substrate, wherein the structured
metallization forms at least structured external contacts for making contact for the MEMS component and are electrically conductively
connected to the surfaces of the metallic column structures not covered by the resist layer.

US Pat. No. 9,817,534

ILLUMINATION DEVICE WITH METALIZED LIGHT-TURNING FEATURES

SnapTrack, Inc., San Die...

1. An illumination device with integrated touch-sensing capability, comprising:
a light guide having a plurality of light-turning features defined by recesses in a surface of the light guide;
a plurality of spaced-apart conductors including a reflective metallic layer, each of the plurality of spaced-apart conductors
extending in a corresponding one of the recesses; and

touch-sensing electronics capable of sensing a change to an electric field of a conductor of the plurality of conductors.

US Pat. No. 9,897,796

ENCAPSULATED SPACERS FOR ELECTROMECHANICAL SYSTEMS DISPLAY APPARATUS

SnapTrack, Inc., San Die...

9. A shutter-based display apparatus, comprising:
a first substrate;
a microelectromechanical systems (MEMS) shutter-based light modulator including at least a first shutter on the first substrate;
an elevated aperture layer (EAL) on the first substrate suspended above and spaced away from the first shutter of the shutter-based
light modulator, and extending across the first shutter of the shutter-based light modulator such that the first shutter of
the shutter-based light modulator is positioned between the EAL and the first substrate; and

a spacer extending up from the first substrate to a height above the elevated aperture layer, wherein the spacer includes
a polymer material positioned between a first layer of structural material and a second layer of structural material in a
direction normal to the first substrate such that the polymer material is encapsulated by the first layer of structural material
and the second layer of structural material, the first layer of structural material separating the polymer material from the
first substrate in a direction normal to the first substrate, wherein the first layer of structural material includes the
same material as the second layer of structural material and the MEMS shutter-based light modulator,

wherein the portion of the spacer formed from the first layer of structural material physically supports the EAL over the
first substrate, and wherein the EAL includes corrugations extending away from the first substrate to a height that is above
a majority of the elevated aperture layer, but below the height of the spacer, and

wherein the spacer forms a portion of the shutter-based light modulator and supports the shutter-based light modulator above
the first substrate.

US Pat. No. 9,876,158

COMPONENT COMPRISING STACKED FUNCTIONAL STRUCTURES AND METHOD FOR PRODUCING SAME

SnapTrack, Inc., San Die...

1. A component comprising:
a first structure, a first thin-film cover and a second structure;
wherein the first thin-film cover covers the first structure without touching the first structure,
wherein the second structure is arranged directly on or above the first thin-film cover, and
wherein at least one of the first and second structures comprises a MEMS structure.

US Pat. No. 9,866,266

FRONT-END CIRCUIT HAVING A TUNABLE FILTER

SnapTrack, Inc., San Die...

1. A front-end circuit comprising:
a first signal path connected to a first antenna connection;
a first filter arranged in the first signal path, wherein the first filter is tunable within a first frequency range;
an extra signal path and a first fixed filter arranged therein, wherein the first fixed filter has a passband for an extra
frequency band, wherein the first fixed filter is not tunable, and wherein the extra frequency band is arranged outside or
inside the first frequency range;

a first narrowband antenna tuner configured to be set to a first tunable frequency range, wherein the first narrowband antenna
tuner is arranged between the first filter and the antenna connection in the first signal path; and

a second narrowband antenna tuner configured to be set to a second tunable frequency range, wherein the second narrowband
antenna tuner is arranged between the first fixed filter and the antenna connection in the extra signal path.

US Pat. No. 10,071,932

GLASS CERAMIC SINTERED COMPACT AND WIRING BOARD

SnapTrack, Inc., San Die...

1. A glass ceramic sintered compact containing a glass component, a ceramic filler and a composite oxide, wherein the glass component is crystallized glass on which is deposited a diopside oxide crystal phase comprising at least Mg, Ca and Si; and the composite oxide comprises at least Al and Co.

US Pat. No. 10,116,399

CIRCUIT ARRANGEMENT FOR RF LOOPBACK

SnapTrack, Inc., San Die...

1. A frontend circuit of a mobile communication device comprising:a transceiver unit comprising a transmitter device, a receiver device and a testing and tuning receiver device, wherein the testing and tuning receiver device is separate from the transmitter device and the receiver device;
a switching device coupled to the transceiver unit, the switching device including a terminal configured to be coupled to an antenna device; and
a control device coupled to the switching device, the control device being configured to operate the frontend circuit in a first mode of operation and in a second mode of operation,
wherein, in the first mode of operation, the switching device is configured by the control device such that a first signal path is routed from the transmitter device of the transceiver unit, through a first switch of the switching device, to a node and from the node back to the testing and tuning receiver device of the transceiver unit in a feedback loop through a second switch of the switching device, wherein the switching device is configured to selectively couple the node to the terminal through a third switch of the switching device, wherein the first switch, the second switch, and the third switch are different switches,
wherein, in the second mode of operation, the switching device is configured by the control device such that a second signal path is routed from the transmitter device of the transceiver unit via the switching device to the terminal or the second signal path is routed from the terminal via the switching device to the transceiver unit, and
wherein the testing and tuning receiver device is configured to receive a radio frequency signal via the first signal path and to measure a strength of the radio frequency signal.

US Pat. No. 10,097,152

MEMS COMPONENT HAVING ALN AND SC AND METHOD FOR MANUFACTURING A MEMS COMPONENT

SnapTrack, Inc., San Die...

1. A MEMS component comprising:a first lower electrode on a substrate;
a first upper electrode overlying the first lower electrode;
a first piezoelectric layer between the first lower electrode and the first upper electrode, wherein the first piezoelectric layer comprises Sc-doped AlN;
a second lower electrode on the substrate;
a second upper electrode overlying the second lower electrode; and
a second piezoelectric layer between the second lower electrode and the first lower electrode, wherein the second piezoelectric layer is thicker than the first piezoelectric layer, and wherein the second piezoelectric layer has a different material composition than the first piezoelectric layer.

US Pat. No. 9,991,873

MICROACOUSTIC COMPONENT AND METHOD FOR THE PRODUCTION THEREOF

SnapTrack, Inc., San Die...

1. A micro acoustic component, comprising:a functional acoustic region;
an inner marginal region surrounding the functional acoustic region and being acoustically coupled to the functional acoustic region;
an outer marginal region surrounding the inner marginal region; and
a cover, which covers the functional acoustic region and has a thin film and a bearing surface, wherein the bearing surface bears directly at least on a part of the inner marginal region.

US Pat. No. 9,985,607

MULTIPLEXER HAVING FEWER INTERMODULATION PRODUCTS

SnapTrack, Inc., San Die...

1. A multiplexer (MUL) which operates with acoustic waves, comprising:a transmit terminal (TxC), a receive terminal (RxC), and a common terminal (CC);
a transmit path, which is interconnected between the transmit terminal (TxC) and the common terminal (CC) and comprises a transmit filter (Tx);
a receive path, which is interconnected between the receive terminal (RxC) and the common terminal (CC) and comprises a receive filter (Rx);
a chip (CH); and
two or more blocker paths interconnected with the common terminal (CC) and comprising blocker electrodes (EL1, EL2) arranged on the chip (CH), which are provided to divert blocker signals to ground (GND), wherein:
at least one of the transmit filter (Tx) or the receive filter (Rx) has a bulk acoustic wave (BAW) resonator;
the two or more blocker paths have at least one BAW resonator; and
at least one of the two or more blocker paths (BP) comprise one or more stop circuits for blocker frequencies, wherein the one or more stop circuits is interconnected between an antenna terminal and the common terminal (CC).

US Pat. No. 9,941,858

ELECTRICOACOUSTIC COMPONENT WITH STRUCTURED CONDUCTOR AND DIELECTRIC LAYER

SnapTrack, Inc., San Die...

1. An electroacoustic component comprising:a substrate configured to carry acoustic waves;
a structured electrically conductive layer arranged directly on the substrate;
a SiO2 layer arranged directly on the structured electrically conductive layer;
a dielectric layer arranged directly on the SiO2 layer, wherein:
the dielectric layer has at least one first region comprising Al2O3 and one or more second regions each comprising a metal; and
the one or more second regions extend through the dielectric layer and a portion of the SiO2 layer; and
an insulating covering layer arranged directly on the dielectric layer and the SiO2 layer, wherein the insulating covering layer comprises a material different from Al2O3.

US Pat. No. 9,929,850

CIRCUIT ARRANGEMENT

SnapTrack, Inc., San Die...

1. A circuit arrangement comprising:an antenna port;
a plurality of ports comprising:
a first receiving port;
a second receiving port;
a first transmission port; and
a second transmission port;
a plurality of 90 degree hybrid couplers connected to transfer an input signal into two output signals that are phase shifted relative to each other; and
first and second quadplexers that each comprises a first duplexer and a second duplexer, wherein the first and second quadplexers and the 90 degree hybrid couplers are interconnected, wherein the first quadplexer comprises four filters, each filter of the four filters being interconnected with a different one of the plurality of ports through a different one of the plurality of 90 degree hybrid couplers that is interconnected between the filter and the one of the plurality of ports.

US Pat. No. 10,020,827

HF FILTER MODULE WITH IMPROVED EXPANDABILITY

SnapTrack, Inc., San Die...

1. A high-frequency (HF) module comprising two filter units, each of the two filter units comprising:a first HF filter with an input and an output; and
a first switch with two possible switching states, wherein:
in each of the two filter units, the first switch is connected to the input or the output of the first HF filter; and
the two filter units are connected in parallel, wherein:
a first filter unit of the two filter units comprises a second switch with two possible switching states,
the first switch of the first filter unit is connected to the input of the first HF filter of the first filter unit, and
the second switch is connected to the output of the first HF filter of the first filter unit.

US Pat. No. 9,998,153

FRONT-END MODULE FOR CARRIER AGGREGATION MODE

SnapTrack, Inc., San Die...

1. A front-end module comprising:an antenna terminal;
a first switch having an input connected to the antenna terminal and a number of k outputs, wherein k is an integer equal or greater than 3; and
a second switch having an input and a number of n outputs, n being an integer equal or greater than 2,
wherein a first output of the first switch is directly connected to the input of the second switch via a bypass path,
wherein a second output of the first switch is connected to the input of the second switch via at least one notch path comprising a notch,
wherein a third output of the first switch is connected to at least one auxiliary signal path assigned to a band of an auxiliary communication system,
wherein each of the n outputs of the second switch is connected to a main signal path assigned to a band of a main communication system respectively,
wherein the notch comprises a resonator adapted to provide a high impedance element for a frequency assigned to the band of the auxiliary communication system,
wherein the first and second switches are configured to set a single band operation mode and a carrier aggregation mode, and
wherein, in the carrier aggregation mode, one of the main signal paths is coupled to the antenna terminal via the at least one notch path, and the at least one auxiliary signal path is coupled to the antenna terminal in parallel to the one of the main signal paths.

US Pat. No. 9,898,974

DISPLAY DRIVE SCHEME WITHOUT RESET

SnapTrack, Inc., San Die...

1. A circuit comprising:
a controller capable of determining a first voltage to apply to an electrode of a display unit of an array of display units
to position a movable element of the display unit from a first position to a second position that is within a position range,
and the controller further capable of determining a second voltage to apply to the electrode of the display unit to position
the movable element of the display unit from the second position to a third position within the position range, the second
voltage applied to the electrode of the display unit after the first voltage, wherein the controller determines the first
voltage and the second voltage based on stored data indicating a current color corresponding to the first position of the
movable element and image data indicating an intended color corresponding to the second position of the movable element, and
wherein:

the first voltage corresponds with a transition in color of the display unit from a first color to a second color;
the first position of the movable element corresponds with the first color; and
the third position of the movable element corresponds with the second color.

US Pat. No. 10,036,734

ULTRASONIC SENSOR WITH BONDED PIEZOELECTRIC LAYER

SNAPTRACK, Inc., San Die...

1. An apparatus comprising:an ultrasonic transmitter for generating ultrasonic energy;
a platen; and
an ultrasonic receiver for detecting ultrasonic energy including:
an array of thin film transistor (TFT) pixel circuits disposed on a TFT substrate;
a piezoelectric receiver layer having first and second opposing surfaces, the first surface bonded with an adhesive to the TFT substrate and to the TFT pixel circuits; and
a receiver bias electrode overlying the second surface of the piezoelectric receiver layer, wherein the piezoelectric receiver layer is in electrical communication with the TFT pixel circuits, wherein the piezoelectric receiver layer is capacitively or resistively coupled through the adhesive with the TFT pixel circuits.

US Pat. No. 10,003,888

TRANSDUCER WITH PIEZOELECTRIC, CONDUCTIVE AND DIELECTRIC MEMBRANE

SNAPTRACK, INC, San Dieg...

1. An apparatus, comprising:a substrate;
a deformable membrane; and
a cavity disposed between the substrate and the deformable membrane such that the deformable membrane spans the cavity,
the deformable membrane including a first piezoelectric layer between first and second metal layers, and a dielectric layer, wherein the dielectric layer is capable of deforming on application of a drive voltage across the first piezoelectric layer to thereby generate an ultrasonic wave, wherein the cavity is a sealed cavity that is enclosed on all sides, and wherein the dielectric layer is directly engaged with the substrate.

US Pat. No. 9,929,751

MOBILE TRANSCEIVER WITH SHARED USER FILTER, METHOD FOR THE OPERATION OF THE MOBILE TRANSCEIVER AND USE OF A FILTER

SnapTrack, Inc., San Die...

1. A mobile communication device comprising:an antenna;
a transceiver circuit having a first port for transmitting first radio-frequency (RF) signals and a second port for transmitting second RF signals, the second RF signals being different than the first RF signals; and
a single RF filter electrically connected between the antenna and the transceiver circuit, the RF filter having an antenna port coupled to the antenna, and a transceiver port coupled to the transceiver circuit, wherein the transceiver port of the RF filter is coupled to the first port and to the second port of the transceiver circuit.

US Pat. No. 10,164,665

HF CIRCUIT AND HF MODULE

SnapTrack, Inc., San Die...

1. A radio frequency (RF) circuit comprisinga first port, a first reception port, a common port, and a third port,
a first duplexer comprising a transmission filter connected between the first transmission port and the common port, and a reception filter connected between the first reception port and the common port,
a third filter connected between the third port and the common port,
a first phase shifter connected between the common port of the first duplexer and the common port of the RF circuit, and
a second phase shifter connected between the third filter and the common port of the RF circuit,
wherein the third filter is a bandpass filter,
wherein the RF circuit is provided to simultaneously transmit signals via the transmission filter and the third filter, or receive signals via the reception filter and the third filter,
wherein at least one of the transmission filter, the reception filter, or the third filter is tunable, and
wherein at least one of the transmission filter, the reception filter, or the third filter comprises a filter topology comprising a parallel inductive element, three serial capacitive elements, and four parallel paths, each of the parallel paths having a parallel circuit with a capacitive element and an inductive element.

US Pat. No. 10,187,034

ELECTROACOUSTIC TRANSDUCER WITH IMPROVED SUPPRESSION OF UNWANTED MODES

SnapTrack, Inc., San Die...

1. An electroacoustic transducer, comprising:a piezoelectric substrate;
busbars arranged on the substrate; and
interdigitated electrode fingers coupled to the busbars and arranged on the substrate such that acoustic waves propagating in the transducer have a velocity profile and an acoustically active region, wherein:
the velocity profile has a periodic structure in the active region,
the periodic structure has a plurality of minimal values and a plurality of maximal values larger than the minimal values,
the periodic structure is flanked on both sides by an edge structure of the velocity profile, a velocity in the edge structure being lower than the maximal values of the periodic structure, and
each edge structure is flanked by a gap structure of the velocity profile and arranged between the gap structure and the periodic structure, a velocity of the gap structure being larger than a maximal value of the velocity of the periodic structure.

US Pat. No. 10,115,671

INCORPORATION OF PASSIVES AND FINE PITCH THROUGH VIA FOR PACKAGE ON PACKAGE

SnapTrack, Inc., San Die...

1. A package-on-package comprising:a bottom package vertically integrated with a second package, wherein
the bottom package includes a first die, a glass via bar, and a package substrate, wherein the first die and the glass via bar are attached to the same side of the package substrate, wherein the first die is oriented laterally to the glass via bar on the package substrate, and wherein the first die and the glass via bar are each electrically coupled to the package substrate by distinct electrical connections;
the second package includes a second die; and
the first die is configured to be in electrical communication with the second die through the glass via bar, wherein the glass via bar includes an amorphous silicate glass sidewall surface that extends through a thickness of the glass via bar and wherein the glass via bar includes an integrated passive component, wherein the integrated passive component is disposed on one or more surfaces of the glass via bar or is embedded within the glass via bar.

US Pat. No. 10,209,072

STACKED LATERAL OVERLAP TRANSDUCER (SLOT) BASED THREE-AXIS ACCELEROMETER

SNAPTRACK Inc., Campbell...

1. A method of fabricating a device, comprising:forming the following on a substrate that extends substantially in a first plane:
a first plurality of electrodes substantially along a first axis;
a second plurality of electrodes substantially along a second axis; and
a first central anchor;
forming a frame and a proof mass that extend substantially in a second plane, wherein the frame is attached to the first central anchor and wherein forming the proof mass includes:
forming a first plurality of slots, in the proof mass, that extend substantially along the first axis; and
forming a second plurality of slots, in the proof mass, that extend substantially along the second axis,
wherein forming the frame involves:
forming first flexures that are configured for attaching the proof mass to the frame and for allowing the proof mass to move substantially along the first axis without causing the frame to move along the first axis, and
forming second flexures that are configured for attaching the frame to the first central anchor, for substantially constraining the frame for motion along the second axis and for allowing the proof mass and the frame to move together along the second axis; and
wherein the first and second pluralities of electrodes are formed substantially in a third plane that is disposed between the first plane and the second plane, the third plane separated from the second plane by a gap.

US Pat. No. 10,148,229

PRE-DISTORTION IN RF PATH IN COMBINATION WITH SHAPING TABLE IN ENVELOPE PATH FOR ENVELOPE TRACKING AMPLIFIER

SNAPTRACK, Inc., San Die...

1. A method for amplifying an input signal, comprising:generating an envelope signal based on the input signal to be amplified by an amplifier;
shaping the envelope signal for controlling an envelope modulated power supply for the amplifier, wherein shaping the envelope signal is based on an indication of a power of the input signal, wherein shaping the envelope signal comprises adjusting a power supply voltage of the amplifier to track the envelope signal while maintaining the power supply voltage above a minimum voltage setting, wherein the power supply voltage is adjusted such that the power supply voltage only tracks the envelope signal while a voltage of the envelope signal is greater than the minimum voltage setting; and
pre-distorting the input signal to be amplified, wherein pre-distorting the input signal is based on the indication of the power of the input signal, wherein pre-distorting the input signal is based on a pre-distortion function and the shaping the envelope signal is based on a shaping function, and wherein the pre-distortion function is set to improve linearity within a linear region of power associated with the input signal and the shaping function is set to improve linearity within a compressed region of power associated with the input signal, wherein the compressed region of power is higher than the linear region of power.

US Pat. No. 10,131,534

STACKED VIAS FOR VERTICAL INTEGRATION

SnapTrack, Inc., San Die...

1. An apparatus comprising:a substrate;
a first electromechanical systems (EMS) device, the first EMS device including a first metal layer and a second metal layer;
a first via structure on the surface of the substrate, the first via structure including the first metal layer, the second metal layer, and a third metal layer, the second metal layer being disposed on the first metal layer and the third metal layer being disposed on the second metal layer at a central portion of the first via structure, wherein the first metal layer of the first EMS device is coupled to the first metal layer of the first via structure, wherein the second metal layer includes a planar portion and sloped portion and the third metal layer includes a planar portion and a sloped portion, and wherein the first metal layer of the first EMS device and the first metal layer of the first via structure are the same metal layers;
a first dielectric layer that includes a portion that contacts and is between a top surface of the first metal layer and a bottom surface of the sloped portion of the second metal layer;
a second dielectric layer that includes a portion that contacts and is between a top surface of the second metal layer and a bottom surface of the sloped portion of the third metal layer; and
an electronic component disposed over the first via structure and coupled to the third metal layer to thereby electrically connect the electronic component to the first EMS device,
wherein each of the first dielectric layer and the second dielectric layer is between about 10 nm to about 1 micron thick.

US Pat. No. 10,171,047

POWER AMPLIFIER WITH STABILISING NETWORK

SnapTrack, Inc., San Die...

1. A circuit comprising:an amplifier having an output configured to receive a modulated supply voltage;
a radio frequency (RF) matching network connected between the output of the amplifier and an output of the circuit, wherein a RF output of the amplifier is generated at the output of the circuit through the RF matching network;
a RF blocking circuit having a first terminal connected to the output of the amplifier, the RF blocking circuit having a first capacitor in parallel with an inductor; and
a control circuit having a first terminal coupled to a second terminal of the RF blocking circuit and a second terminal coupled to ground, wherein the control circuit includes a first resistor connected in series with a second capacitor, wherein the second capacitor is in series with the inductor of the RF blocking circuit.

US Pat. No. 10,164,601

BAW RESONATOR HAVING TEMPERATURE COMPENSATION

SnapTrack, Inc., San Die...

1. A bulk acoustic wave (BAW) resonator comprising:a substrate; and
a layer stack disposed thereon, the layer stack comprising:
a bottom electrode layer;
a top electrode layer;
a piezoelectric layer arranged between the bottom and top electrode layers;
an acoustic mirror arranged between the bottom electrode layer and the substrate, wherein the acoustic mirror comprises at least a high impedance layer and a low impedance layer; and
a compensation layer comprising a material having a positive temperature coefficient of viscoelastic properties, wherein the compensation layer is arranged between the acoustic mirror and the bottom electrode layer,
wherein a total thickness of a topmost low impedance layer and the compensation layer corresponds to an odd multiple of ?/4 and is at least 3?/4, and
wherein ? is a wavelength of an acoustic wave to be reflected.

US Pat. No. 10,164,607

ADJUSTABLE CONDENSER

SnapTrack, Inc., San Die...

1. An integrated circuit device comprising:a variable capacitive element;
a first switch having a first terminal coupled to a first terminal of the capacitive element; and
a second switch coupled between the first terminal and a second terminal of the capacitive element in the integrated circuit device.

US Pat. No. 10,164,166

MEMS COMPONENT AND METHOD FOR ENCAPSULATING MEMS COMPONENTS

SnapTrack, Inc., San Die...

1. A method of making a MEMS component the method comprising:Providing a substrate having an active surface, wherein electrical component structures and contact areas for making electrical contact with the component structures are arranged on the substrate;
forming metallic column structures on the contact areas, the metallic column structures projecting beyond the component structures;
arranging a metallic frame structure on the active surface of the substrate to enclose the component structures together with the column structures;
forming a cured resist layer that is seated on the frame structure and the column structures such that a cavity is enclosed between substrate, frame structure and resist layer, wherein at least one portion of selected column structures and the frame structure penetrates through the resist layer to an extent such that those surfaces of the metallic structures that face away from the substrate are not covered by the resist layer; and
forming a structured metallization over a surface of the resist layer that faces away from the substrate, wherein the structured metallization forms at least structured external contacts for making contact for the MEMS component and are electrically conductively connected to the metallic structures not covered by the resist layer.

US Pat. No. 10,164,525

VOLTAGE REGULATOR WITH IMPROVED TRACKING OF A REFERENCE VOLTAGE

SnapTrack, Inc., San Die...

1. A voltage regulator comprising:a switching stage;
an inductive element coupled between the switching stage and an output of the voltage regulator; and
a feedback path configured to control the switching stage, wherein the feedback path comprises:
an amplifier;
a first resistive element having a first terminal coupled to a first terminal of the inductive element;
a first capacitive element having a first terminal coupled to a second terminal of the inductive element, a second terminal of the first resistive element and a second terminal of the first capacitive element being coupled to a first input of the amplifier; and
a switch coupled between a second input of the amplifier and the second terminal of the inductive element.

US Pat. No. 10,277,259

FRONT-END CIRCUIT FOR SIMULTANEOUS TRANSMISSION AND RECEPTION OPERATION

SnapTrack, Inc., San Die...

1. A front-end circuit comprising:a first antenna connection;
a first signal path with a first tunable filter arranged therein and coupled to the first antenna connection;
a second signal path with a second tunable filter arranged therein and coupled to the first antenna connection;
a third signal path with a third tunable filter arranged therein and coupled to the first antenna connection, wherein at least one of the first tunable filter, the second tunable filter, or the third tunable filter comprises a series signal path comprising a plurality of circuit nodes, each of the circuit nodes connected to electrical ground through a parallel circuit having a tunable capacitive element in parallel with an inductive element, the tunable capacitive element and the inductive elements having first terminals coupled to the series signal path and second terminals coupled to electrical ground, wherein the plurality of circuit nodes comprises at least four circuit nodes, and wherein end circuit nodes of the plurality of circuit nodes are connected to one another via a bridging inductance connected in parallel with the series signal path;
at least one phase shifter arranged in at least one of the first, second, or third signal paths between a respective filter and the first antenna connection; and
a control circuit configured to tune frequency bands of the first tunable filter, the second tunable filter, and the third tunable filter.

US Pat. No. 10,236,855

TUNABLE RF FILTER CIRCUIT

SnapTrack, Inc., San Die...

1. A tunable RF filter circuit, comprising:an input, an output and therebetween a signal path having a first signal route and a second signal route in parallel with the first signal route;
an impedance element interconnected in the first signal route, the impedance element having a first terminal directly connected to a first node and a second terminal directly connected to a second node; and
a plurality of resonant circuits, each of the plurality of resonant circuits interconnecting the second signal route with electric ground, wherein:
the plurality of resonant circuits comprise N resonant circuits, N being greater than 3;
each of the plurality of resonant circuits is directly connected to a different node of the second signal route, the different nodes being between first and second terminals of the second signal route, the first terminal of the second signal route being directly connected to the first node and the second terminal of the second signal route being directly connected to the second node;
each of the plurality of resonant circuits is at least one of electrically or magnetically coupled to another resonant circuit of the plurality of resonant circuits and each of the plurality of resonant circuits comprises a tunable impedance element; and
the plurality of resonant circuits have a higher quality factor Q than coupling elements which couple the plurality of resonant circuits together.

US Pat. No. 10,205,430

RESONATOR CIRCUIT HAVING GREATER DEGREES OF FREEDOM, FILTER WITH IMPROVED TUNABILITY, AND DUPLEXER WITH IMPROVED TUNABILITY

SnapTrack, Inc., San Die...

1. A resonator circuit comprising:a resonator;
an impedance transformer; and
an impedance circuit configured to adjust a frequency spacing between a pole and a resonant frequency of the resonator circuit,
wherein the impedance circuit has a first impedance and includes an impedance element,
wherein the impedance transformer is interconnected between the resonator and the impedance circuit, and
wherein the impedance transformer is configured to transform the first impedance to a second impedance different from the first impedance and comprises a transformation circuit selected from: a generalized impedance converter (GIC), an negative impedance converter (NIC), a generalized impedance inverter (GII) and a negative impedance inverter (NII).

US Pat. No. 10,200,078

MULTIPLEXER AND MOBILE COMMUNICATION DEVICE COMPRISING A MULTIPLEXER

SnapTrack, Inc., San Die...

1. A multiplexer, supporting signal transmission in a main signal path and a second signal path, comprising:a transmit (TX)-side hybrid with a main TX port and a second TX port;
a receive (RX)-side hybrid with a main RX port and a second RX port;
an antenna-side hybrid with a main antenna port and a second antenna port;
a first duplexer;
a second duplexer;
wherein not more than one of the main TX port, the second TX port, the main RX port, the second RX port, the main antenna port, and the second antenna port is terminated to ground,
wherein the first duplexer connects the TX-side hybrid to the antenna-side hybrid and connects the RX-side hybrid to the antenna-side hybrid, and
wherein the second duplexer connects the TX-side hybrid to the antenna-side hybrid and connects the RX-side hybrid to the antenna-side hybrid.

US Pat. No. 10,298,207

FILTER WITH IMPROVED LINEARITY

SnapTrack, Inc., San Die...

1. A filter circuit comprising:a filter comprising:
a serial signal path coupling a first filter port to a second filter port;
nodes arranged in the serial signal path, each of the nodes being connected to a fixed potential via a respective parallel branch;
resonators arranged in the serial signal path and the parallel branches, the resonators comprising:
a first set of cascaded resonators arranged in a first parallel branch, and
a second set of cascaded resonators arranged in the serial signal path; and
at least one of a first capacitor or a second capacitor, the first capacitor arranged in series or in parallel with the first parallel branch, the second capacitor arranged in series or in parallel with the serial signal path, wherein:
each of the parallel branches have a total capacitance resulting from a capacitance of the resonators in the parallel branch and a third capacitor connected in parallel or in series with the resonators in the parallel branch, and
the total capacitances are the same except for one parallel branch.

US Pat. No. 10,298,202

BAW RESONATOR WITH REDUCED HEAT BUILD-UP, HF FILTER COMPRISING BAW RESONATOR, DUPLEXER COMPRISING HF FILTER, AND PRODUCTION METHOD

SnapTrack, Inc., San Die...

1. A bulk acoustic wave resonator (BAWR) comprising:an electro-acoustically active region with two electrodes and a piezoelectric layer arranged between them;
a support substrate;
an acoustic mirror arranged between the electro-acoustically active region and the support substrate and comprising a layer of low thermal conductivity and a layer of high thermal conductivity; and
a thermal bridge coupled to the support substrate and the electro-acoustically active region;
wherein the layer of low thermal conductivity is suitable for reducing a heat flow from the electro-acoustically active region to the support substrate, and
wherein the thermal bridge is provided to increase the heat flow from the electro-acoustically active region to the support substrate.

US Pat. No. 10,277,195

ELECTRO-ACOUSTIC TRANSDUCER AND ELECTRO-ACOUSTIC COMPONENT COMPRISING AN ELECTRO-ACOUSTIC TRANSDUCER

SnapTrack, Inc., San Die...

1. An electroacoustic transducer comprising:a first bus bar and a second bus bar;
a first plurality of electrode fingers and a second plurality of electrode fingers; and
a plurality of sub tracks,
wherein each of the first plurality of electrode fingers is electrically connected to the first bus bar and each of the second plurality of electrode fingers is electrically connected to the second bus bar,
wherein each sub track extends along a longitudinal direction,
wherein all sub tracks are arranged one next to another in a transversal direction,
wherein at least a first of the sub tracks comprises segments of the first plurality and second plurality of electrode fingers and has an associated sub track with segments of the first plurality and second plurality of electrode fingers,
wherein the segments of the first sub track are shifted by a distance S=?/2 along the longitudinal direction relative to the segments of the associated sub track,
wherein a distance (D) between adjacent sub tracks is 4??D?6? in the transversal direction, and
wherein ? is an acoustic wavelength.

US Pat. No. 10,270,582

DUPLEXER HAVING IMPROVED REFLECTIVITY

SnapTrack, Inc., San Die...

1. A duplexer comprising:an antenna terminal; and
two sub-paths including a transmit path and a receive path, the two sub-paths connected to the antenna terminal, wherein:
the transmit path comprises:
at least one phase shifter; and
serially interconnected series resonators and, in parallel therewith,
n parallel paths connected to ground;
each parallel path comprises one parallel resonator or a cascade of serially interconnected parallel resonators;
n is an integral number with 0 at least one of the n parallel resonators is connected to ground in series with an inductance in the transmit path; and
a parallel resonator is connected directly to ground in a first parallel path that is nearest to the antenna terminal and no inductance is arranged in the first parallel path;
the antenna terminal is coupled with one or more of:
at least one further transmit branch having a further transmit filter:
a further receive branch having a further receive filter; or
a further duplexer;
the at least one phase shifter is arranged between at least one of:
the antenna terminal and the duplexer;
the antenna terminal and the further branch; or
the antenna terminal and the further duplexer;
the at least one phase shifter is configured to, at a duplexer input, rotate an impedance towards infinity for frequencies of the further receive branch, the further transmit branch, or the further duplexer;
the duplexer is configured to operate in a carrier aggregation mode; and
the carrier aggregation mode provides for:
transmitting and receiving operation via the transmit path and the receive path of the duplexer; and
at least one of:
receive operation via the further receive filter;
transmit operation via the further transmit filter; or
at least one receive operation by the receive filter of the further duplexer or transmit operation by the transmit filter of the further duplexer.