Patent ID: 9685933
Date: 2017-06-20
CPC Classifications: H02M,H03F,H03H

Claim:
1. A circuit comprising: an input chopper receiving an input signal; an amplifier receiving a first signal corresponding to an output of the input chopper; an output chopper, synchronized with the input chopper, receiving a second signal corresponding to an output of the amplifier, the output chopper comprising a first set of switches controlled by at least clocked phase a notch filter coupled to receive the output of the output chopper, the notch filter comprising a sampling capacitor, a hold capacitor, and a second set of switches between the sampling capacitor and the hold capacitor, wherein the sampling capacitor is directly coupled to an output of the output chopper with no switches therebetween, wherein the second set of switches is temporarily closed during each output chopper switch cycle to connect the sampling capacitor to the hold capacitor, pursuant to a phase