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Neglecting Channel Length Modulation, what is the output impedance of the following C.S. stage?

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Neglecting Channel Length Modulation, what is the output impedance of the following C.S. stage?

(a) R4

(b) R4 || R2

(c) R4 || (R2 + R3)

(d) R4 || [(R2 + R3) || R1]

I have been asked this question during a job interview.

My question is based upon MOSFET Amplifier with CS Configuration in section FET Amplifiers of Analog Circuits

1 Answer

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Correct option is (a) R4

To explain I would say: The output impedance is calculated by a simple small signal analysis. We set Vcc and V1 to 0 and place a voltage source at the output node. We find that only R4 is the output impedance. Note that even if R2 seems to be connected to R4, it doesn’t affect the output impedance since during small signal analysis, the node where R2 and R4 meets, is set to ground.

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