US Patent No. 10,298,242

PHASE CONTROL OSCILLATOR


Patent No. 10,298,242
Issue Date May 21, 2019
Title Phase Control Oscillator
Inventorship Ken Miyahara, Saitama (JP)
Kazunori Hasegawa, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,298,242

1. A phase control oscillator that outputs an oscillation signal at a predetermined frequency, the phase control oscillator comprising:a voltage control oscillator, configured to output the oscillation signal based on a control voltage;
a phase comparator, configured to output a phase difference information indicative of a phase difference between a reference signal and the oscillation signal;
a first storage unit, configured to store the phase difference information output from the phase comparator;
a loop filter, configured such that if the phase control oscillator starts operating, the loop filter outputs the control voltage based on the phase difference information stored in the first storage unit to the voltage control oscillator; and
a second storage unit, configured to store a deviation information, and the deviation information being indicative of a deviation between the phase difference when the loop filter outputs the control voltage in a case where the phase control oscillator starts operating and the phase difference indicated by the phase difference information stored in the first storage unit, wherein
after the loop filter outputs the control voltage in response to the phase control oscillator starting operating, the loop filter outputs the control voltage based on the phase difference information output from the phase comparator and the deviation information stored in the second storage unit, to the voltage control oscillator.