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Working with basic emitter follower

Derive the expressions for closed-loop gain Avf, input resistance Rif, and output resistance Rof of the following image.


Solution Preview

This is a schematic of the basic emitter follower circuit. Just a transistor and a single resistor from the emitter to ground.
<br>Writing the voltage equation around the input loop,
<br>Vi - Vbe - Vo = 0 ---------- 1
<br>Making Vbe very small or the gain large, we have, Vi =(approx.) = Vo
<br>The output ...

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