Discussion
Why is a feedback amplifier's distortion usually specified across the band?
Answer: B
Because the loop gain falls with frequency, the same amplifier corrects far less at twenty kilohertz than at one, so a single figure would flatter it. Device linearity is roughly constant, load variation is a separate matter that also deserves specifying, and the equipment is adequate. A specification that varies by a factor of ten across the intended band has to be quoted across that band, and a single headline figure should always prompt the question of where it was measured.
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