Discussion
Which stage would you use between a high-gain amplifier and a loudspeaker?
Answer: D
A loudspeaker is a low impedance and a high-gain stage has a high output impedance, so a follower's impedance transformation is exactly what is needed, at the cost of no further voltage gain. Another common-emitter stage would have a high output impedance too, and common base is an input configuration. Interfaces are where impedance rather than gain decides the choice, and a follower exists for precisely those places. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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