Discussion
What is meant by an amplifier's midband gain?
Answer: D
Midband is the flat region between the two roll-offs, where the coupling capacitors are effectively short circuits and the shunt capacitances effectively open ones. The geometric mean happens to lie in that region but does not define it, one kilohertz is a common measurement frequency rather than a definition, and no averaging is involved. The whole value of the midband idea is that both sets of capacitances can be ignored there, which is exactly the assumption every small-signal gain calculation makes.
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