Discussion
Why is the feedback network usually made from resistors rather than active components?
Answer: D
Since the closed-loop gain is the reciprocal of the fraction, the network's own accuracy appears in the answer with no reduction, so it must be built from the most predictable components available. Supply current is trivial either way, and neither the bandwidth nor the phase claim is strictly true, since stray reactances affect resistors too. The whole point of feedback is to transfer accuracy to the network, and that is only worthwhile if the network deserves the trust.
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