If a C.E. stage has a load Rl and transconductance gm, what is the factor by which the capacitance between the base and the collector at the input side gets multiplied?
A)1 + gmrl
B)1 - gmrl
C)1 + 2*gmrl
D)1 - 2*gmrl

Question

Quizplus · Accepted Answer

The capacitance between the base and collector at the input side gets multiplied by the Miller effect, which is represented by the factor $1 + gmRl$, where $gm$ is the transconductance and $Rl$ is the load resistance. This effect significantly increases the input capacitance due to the feedback through the amplifier, leading to the correct answer being $1 + gmRl$.

If a CE Stage Has a Load Rl and Transconductance Gm, What