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Neglecting Channel Length Modulation, if the transconductance of a MOSFET increases, the output impedance of the follower stage can _________

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Neglecting Channel Length Modulation, if the transconductance of a MOSFET increases, the output impedance of the follower stage can _________

(a) increase

(b) decrease

(c) increase linearly

(d) decrease non-linearly

This question was addressed to me in an internship interview.

This is a very interesting question from MOSFET Amplifier with CD Configuration topic in portion FET Amplifiers of Analog Circuits

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Correct option is (b) decrease

Easy explanation: The output impedance of a follower stage is (1/gm || Rd). If the transconductance increases, the output impedance will decrease, as can be seen from the formulae.

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