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What is the input impedance for the following circuit?

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What is the input impedance for the following circuit?

(a) ro

(b) 1/gm

(c) Rd || ro

(d) Infinite

This question was posed to me by my school principal while I was bunking the class.

My doubt stems from MOSFET Amplifier with CG Configuration in section FET Amplifiers of Analog Circuits

1 Answer

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Right answer is (b) 1/gm

The explanation: The input to the CG stage is placed at the source of M1. The impedance looking into the node of M1 is simply 1/gm. Hence, the input impedance is 1/gm. Rd || ro is the output impedance if channel length modulation is present.

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