Discussion
Assertion (A): Assertion: A cascode stage reaches a higher bandwidth than a common-emitter stage of the same gain.
Reason (R): Reason: Its lower device operates with almost no voltage gain, so Miller multiplication is suppressed.
Select the correct answer from the options below.
Answer: D
Both are true and the second is the mechanism: the input capacitance is no longer multiplied by the stage gain, so the bandwidth is set by the device rather than by the Miller effect. The full voltage gain is still taken, but at the upper device where no capacitance bridges input to output. Separating where the gain is taken from where the capacitance is seen is the whole idea, and it recurs in every wideband topology.
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