Patent ID: 11909364
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Control (Instruments)
Classification: CPC H  G | IPC G  H

Claim 15:
16. A method comprising:
receiving a noninverting input to a chopper amplifier circuit, the chopper amplifier circuit comprising an operational amplifier and a notch filter that is in series connection with the operational amplifier and has an output of the notch filter connected as a feedback signal to an inverting input of the operational amplifier, wherein a chopping delay switch is in a closed state to short-circuit a first branch of the notch filter having a first capacitor and a second branch of the notch filter having a second capacitor, to each other;
determining establishment of the feedback signal at the operational amplifier, according to a control circuit connected to the operational amplifier;
generating a delay to opening the chopping delay switch, based on the determining the establishment of the feedback signal at the operational amplifier; and
changing the chopping delay switch to an open state, based on the determining the establishment of the feedback signal at the operational amplifier and the delay.