Discussion
Why does a common-emitter stage's bandwidth depend on what precedes it?
Answer: D
The Miller-multiplied capacitance at the input works against whatever resistance drives it, so the same stage is fast or slow according to its source. Its gain is set by transconductance and load rather than by the drive, no reflection of the collector load occurs, and the low-frequency break does depend on the source but is not what limits the bandwidth. That a stage has no bandwidth of its own, only a bandwidth in a context, is worth internalising before any figure is quoted.
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