Discussion
Assertion (A): Assertion: A cascode stage has a higher gain-bandwidth product than a single common-emitter stage.
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 overall voltage gain is still taken, but at the upper device where it does no harm. Separating where the gain is taken from where the capacitance is seen is the whole trick, and it recurs in every wideband amplifier topology.
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