Discussion
What does the loop gain of a feedback amplifier describe?
Answer: A
Loop gain is the open-loop gain multiplied by the fraction fed back, and it is the single quantity that decides how much every benefit of feedback amounts to. The gain with the loop broken is the open-loop gain, and the returned fraction is the feedback factor alone. Because desensitivity, impedance change, distortion reduction and bandwidth extension all scale with one plus the loop gain, computing that one number first tells you how much the feedback is doing. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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