Discussion
Assertion (A): Assertion: A stage's high-frequency limit can be improved by lowering the source impedance that drives it.
Reason (R): Reason: The Miller capacitance forms a time constant with the source resistance.
Select the correct answer from the options below.
Answer: B
Both are true and the second is the reason: the break frequency is set by the product of the source resistance and the multiplied capacitance, so reducing either raises it. That is why a follower placed ahead of a common-emitter stage can transform its bandwidth without any change to the stage itself. When a limit is a product of two quantities, either factor is a legitimate target and the cheaper one wins.
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