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Working with basic emitter follower

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

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The expert derives the expression for closed-loop gain Avf, input resistance Rif and output resistance Rof for an image. The solution helps with all explanations and mathematical steps.

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This is a schematic of the basic emitter follower circuit. Just a transistor and a single resistor from the emitter to ground.

Writing the voltage equation around the input loop,

Vi - Vbe - Vo = 0 ---------- 1

Making Vbe very small or the gain large, we have, Vi =(approx.) = Vo

The ...

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