US Patent No. 10,224,879

PEAK DETECTOR AND OPERATIONAL AMPLIFIER CIRCUIT THEREIN


Patent No. 10,224,879
Issue Date March 05, 2019
Title Peak Detector And Operational Amplifier Circuit Therein
Inventorship Chua-Chin Wang, Kaohsiung (TW)
Deng-Shian Wang, Kaohsiung (TW)
Hao-Chun Huang, Kaohsiung (TW)
Assignee NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)

Claim of US Patent No. 10,224,879

1. A peak detector comprising:an operational amplifier circuit including a first chopper, a transconductance amplifier, a second chopper and a low pass filter, the transconductance amplifier is electrically connected with the first and second choppers, and the low pass filter is electrically connected with the second chopper, wherein the second chopper is configured to modulate a offset voltage of the transconductance amplifier to higher frequency, and the low pass filter is configured to filter out the offset voltage with higher frequency;
a charge transistor electrically connected with the low pass filter of the operational amplifier circuit, wherein turning on or turning off the charge transistor is determined by a output signal of the low pass filter; and
a charge capacitor electrically connected with the charge transistor and the operational amplifier circuit, wherein when the charge transistor is turned on, the charge capacitor is charged for detecting a peak of a input voltage signal.