Discussion
What does a driver stage supply to a power output stage?
Answer: D
An output device passing amperes at a current gain of fifty needs tens of milliamps of drive, far more than a small-signal voltage amplifier can deliver, so a driver stage stands between them. Voltage gain comes from earlier stages, bias from the spreader, and feedback from the output node. Each stage in a chain exists because the one before it cannot meet the demands of the one after, and naming that mismatch explains why the stage is there at all. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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