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If channel length modulation is present, what is the output impedance of the following circuit?

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If channel length modulation is present, what is the output impedance of the following circuit?

(a) Rd

(b) Rd || ro

(c) ro

(d) 0

I had been asked this question by my school teacher while I was bunking the class.

Origin of the question is MOSFET Amplifier with CG Configuration in chapter FET Amplifiers of Analog Circuits

1 Answer

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Right option is (b) Rd || ro

For explanation I would say: In presence of channel length modulation, ro appears to be in parallel to Rd. Hence, the total output impedance becomes Rd || ro. In the absence of channel length modulation, the output impedance is Rd only.

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