Discussion
What is the Miller effect in a common-emitter stage?
Answer: B
Because the collector swings in antiphase to the base, the collector-base capacitance appears at the input multiplied by one plus the voltage gain, which usually dominates the stage's bandwidth. The emitter resistance is indeed multiplied at the base, but that is the impedance-reflection rule rather than the Miller effect. A small capacitance across an inverting gain becomes a large one, which is why the cascode arrangement, with no voltage gain at the lower device, exists at all.
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