In the following C.S. stage shown below, what is the output impedance, if channel length modulation is neglected?(a) 2ro(b) 5(c) R1(d) 0The question was posed to me in an international level competition.The origin of the question is MOSFET Amplifier with CS Configuration topic in chapter FET Amplifiers of Analog Circuits

In the following C.S. stage shown below, what is the output impedance,

1.	In the following C.S. stage shown below, what is the output impedance, if channel length modulation is neglected?(a) 2ro(b) 5(c) R1(d) 0The question was posed to me in an international level competition.The origin of the question is MOSFET Amplifier with CS Configuration topic in chapter FET Amplifiers of Analog Circuits
Answer» Right answer is (c) R1 To explain: If the EARLY effect is NEGLECTED, ro –> ∞ and hence, the output impedance is only R1. This is inferred by PERFORMING the small SIGNAL analysis at the output node or the drain of the M1.

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