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Input resistance of common gate of the amplifier is __________(a) zero(b) infinity(c) extremely low(d) extremely highI 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

Answer»

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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