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Input resistance of common gate of the amplifier is __________

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Input resistance of common gate of the amplifier is __________

(a) zero

(b) infinity

(c) extremely low

(d) extremely high

I have been asked this question during an internship interview.

The question is from A Generalized FET Amplifier in division Field-Effect Transistors of Electronic Devices & Circuits

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Correct choice is (c) extremely low

To explain I would say: For a Common gate amplifier, Current gain is about unity, input resistance is low, output resistance is high a CG stage is a current “buffer”.  It takes a current at the input that may have a relatively small Norton equivalent resistance and replicates it at the output port, which is a good current source due to the high output resistance.

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