Discussion
Why does feedback reduce an amplifier's drift with temperature?
Answer: D
A drift in an internal gain is an error inside the loop and is reduced by one plus the loop gain, exactly as a distortion or a gain change is. The devices still warm, the network's coefficient matters for the closed-loop gain rather than the drift reduction, and bias stabilisation is a separate local mechanism. Feedback does not care what caused an internal error, only where it entered, which is why one mechanism addresses drift, distortion and device spread together.
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