Discussion
Why is a chopper-stabilised amplifier used for very small direct signals?
Answer: B
Chopping translates a slowly varying signal up to the chopping frequency, where offset drift and one-over-f noise have fallen away, then recovers it by synchronous detection. Gain, bias current and bandwidth are not what it addresses - bandwidth is if anything reduced. It is the same technique used to escape flicker noise in any low-frequency measurement, applied here to escape the drift that limits a direct-coupled stage.
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