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The output impedance of the follower is _____________

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The output impedance of the follower is _____________

(a) Low

(b) Very low

(c) Depends on it’s transconductance and low

(d) High

This question was addressed to me by my college professor while I was bunking the class.

Question is taken from MOSFET Amplifier with CD Configuration topic in portion FET Amplifiers of Analog Circuits

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Correct option is (c) Depends on it’s transconductance and low

Explanation: The output impedance of the follower is a function of the transconductance. But it’s also a function of the channel length modulation. But the resistance offered due to channel length modulation is much greater than the inverse of the transconductance. It can be concluded that the output of the follower depends on the transconductance and it’s low.

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