Draw small signal hybrid π equivalent circuit for npn transistor.

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written 3.9 years ago by

teamques10 ★ 69k

A small signal resistance $rπ$ is defined as, $rπ = {Vbe\over Ib}$
Alternate equation for $rπ$ is $rπ = {Vbe\over IBQ}={βFVT\over ICQ}$
$rπ$ is called as diffusion resistance or base emitter input resistance.Note that value of resistance is depends on Q-point parameters.
At output side of …

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