Discussion
What does a cascode cost compared with a single common-emitter stage?
Answer: A
The arrangement needs a second transistor and enough supply voltage to bias both in their active regions, which is the whole of its cost. The gain is comparable or better, it remains beta-independent, and the input capacitance is far lower rather than higher. A technique whose only price is a component and some headroom is unusually cheap, which is why the cascode appears wherever both gain and bandwidth are wanted from one stage.
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