Noise in chopper-stabilized amplifier applications

摘要

A common complaint about chopper-stabilized amplifiers is that chopper noise will interfere with the signal and cancel the positive feature of almost-negligible offset voltage and offset-voltage drift. This is often claimed without fully evaluating the noise performance of the chopper amplifier in the application of interest. The amount of noise the amplifier will contribute depends on the closed-loop gain, and bandwidth as well as the value of the feedback resistors and the input referred voltage and current noise.