Discussion
Why does a feedback amplifier's distortion rise at high frequencies?
Answer: D
Distortion is divided by one plus the loop gain, and since the open-loop gain falls steadily above the dominant pole, the loop gain and hence the correction fall with it. Device linearity is roughly frequency-independent over the audio range, the network's phase affects stability rather than distortion directly, and the bias current does not fall. A specification quoted at one frequency and assumed at all others is a common source of disappointment, and this is the mechanism behind it.
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