If channel length modulation is present, what is the voltage gain?(a) ro1 / {(1/gm1 || ro2) + ro1}(b) ro2 / (1/gm1 + ro1)(c) ro2 / (1/gm1 + 3ro2)(d) ro2 / (2/gm1 + ro2)The question was posed to me in exam.Origin of the question is MOSFET Amplifier with CD Configuration in portion FET Amplifiers of Analog Circuits

If channel length modulation is present, what is the voltage gain?(a)

1.	If channel length modulation is present, what is the voltage gain?(a) ro1 / {(1/gm1 \|\| ro2) + ro1}(b) ro2 / (1/gm1 + ro1)(c) ro2 / (1/gm1 + 3ro2)(d) ro2 / (2/gm1 + ro2)The question was posed to me in exam.Origin of the question is MOSFET Amplifier with CD Configuration in portion FET Amplifiers of Analog Circuits
Answer» Right option is (a) ro1 / {(1/gm1 \|\| RO2) + ro1} For explanation I would say: M2 behaves as a Source follower i.e. it is being used in a C.D. configuration. M1 PROVIDES a output resistance of ro1but M2 provides an IMPEDANCE of (1/gm2\|\|ro2). THUS, from the VOLTAGE gain of a follower stage, we conclude the overall voltage gain is ro1 / {(1/gm1 \|\| ro2) + ro1}.

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