If Channel Length Modulation is present and gm is the transconductance of M1, what happens to the output resistance of for a fixed V2 in the following circuit?(a) (1 + (gm * ro)) * Rs + ro(b) (1 + (gm * ro)) * ro + Rs(c) (ro + 2) * Rs(d) (1 + (gm * ro)) * RsI have been asked this question in a national level competition.The question is from MOSFET Amplifier with CS Configuration in portion FET Amplifiers of Analog Circuits

If Channel Length Modulation is present and gm is the transconductance

1.	If Channel Length Modulation is present and gm is the transconductance of M1, what happens to the output resistance of for a fixed V2 in the following circuit?(a) (1 + (gm * ro)) * Rs + ro(b) (1 + (gm * ro)) * ro + Rs(c) (ro + 2) * Rs(d) (1 + (gm * ro)) * RsI have been asked this question in a national level competition.The question is from MOSFET Amplifier with CS Configuration in portion FET Amplifiers of Analog Circuits
Answer» Right answer is (a) (1 + (gm * ro)) * Rs + ro Explanation: By PERFORMING a small signal analysis of the FOLLOWING CIRCUIT, we find that the output impedance of the circuit is simply (1 + (gm * ro)) * Rs + ro. For doing this analysis, we have to short V1 and V2 to ground. Thereafter, we place a voltage source at the input NODE and measure current. The impedance measured will be the output impedance which is (1 + (gm * ro)) * Rs + ro.

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