Auto Correction Feedback for ripple suppression in a chopper amplifier

This paper proposes a local feedback, named auto correction feedback (ACFB), used in a chopper amplifier to suppress its offset related ripple. It nulls out amplifier's offset in DC domain which would otherwise become modulated ripple at the chopper amplifier's output, instead of filtering the ripple by a post filter. The proposed chopper amplifier with the ACFB achieves 45 dB ripple attenuation without introducing noise penalty, which has been proved by both simulation and measurement.