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

Claim 0:
1. An apparatus, comprising:
a chopper amplifier comprising an operational amplifier and a notch filter, the notch filter to be operated by a chopping pulse and configured to:
receive as input, an output of the operational amplifier; and
produce a chopper amplifier output that is provided as a feedback signal to an inverting input of the operational amplifier;

a chopping delay switch connected to a first branch of the notch filter having a first capacitor, and connected to a second branch of the notch filter having a second capacitor; and
a control circuit configured to:
close the chopping delay switch to short-circuit the first branch and the second branch of the notch filter to each other;
detect establishment of the feedback signal at the chopper amplifier; and
in response to detecting the establishment of the feedback signal at the chopper amplifier, open the chopping delay switch.