Apparatus and methods for electronic amplification

摘要

Apparatus and methods for electronic amplification are provided. In one embodiment, a method of electronic amplification includes amplifying a differential input voltage signal to generate a feed-forward signal, chopping the feed-forward signal at a chopping frequency to generate a chopped feed-forward signal, notch filtering the chopped feed-forward signal at the chopping frequency to generate a notched signal, generating an input offset correction signal based at least partly on the notched signal, and amplifying the differential input voltage signal using a signal amplification block to generate an output signal. Amplifying the differential input voltage signal using the signal amplification block includes chopping the input signal at the chopping frequency to generate a chopped input signal and combining the chopped input signal and the offset correction signal to reduce input offset error of the signal amplification block.

主权项

1. An amplifier comprising:
a signal amplification block configured to receive a differential input voltage signal and to amplify the differential input voltage signal to generate an output signal; and a feed-forward offset correction block configured to receive the differential input voltage signal and to generate an input offset correction signal, wherein the feed-forward offset correction block comprises:
a first feed-forward amplification circuit configured to amplify the differential input voltage signal to generate a feed-forward signal;a feed-forward chopping circuit configured to chop the feed-forward signal at a chopping frequency to generate a chopped feed-forward signal; anda notch filter configured to attenuate the chopped feed-forward signal at the chopping frequency to generate a notched signal, wherein the feed-forward offset correction block is configured to generate the input offset correction signal based at least partly on the notched signal, and wherein the signal amplification block is further configured to receive the input offset correction signal from the feed-forward offset correction block and to reduce an input offset voltage of the amplifier using the input offset correction signal.