Discussion
What does an auto-zeroing amplifier do?
Answer: C
Auto-zeroing disconnects the input at intervals, measures the offset that remains, and stores a correction that is applied while the amplifier is in use. Gain control, input coupling and common-mode nulling are other functions. Because the measurement is repeated, the correction follows the drift rather than being fixed at one temperature - which is precisely the limitation of a one-off trim that this technique escapes.
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