Discussion
What does an amplifier's equivalent input noise voltage let you do?
Answer: B
Referring the noise to the input removes the gain from the comparison, so two amplifiers of different gain can be judged on the same footing. Distortion, bias and bandwidth are all specified separately. Referring an imperfection to the input is a general technique, and it works because everything at the input is multiplied by the same gain as the signal.
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