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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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    Solution Preview

    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 ...

    Solution Summary

    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.