If Channel Length modulation is neglected, what is the voltage gain from the source to the drain for the CG stage shown below?(a) gm * Rd * {2Rs / (Rs + 1/gm)}(b) gm * Rd * {Rs / (Rs + 2/gm)}(c) gm * Rd * {2Rs / (Rs – 1/gm)}(d) gm * Rd * {Rs / (Rs + 1/gm)}The question was asked in an international level competition.This question is from MOSFET Amplifier with CG Configuration topic in chapter FET Amplifiers of Analog Circuits

If Channel Length modulation is neglected, what is the voltage gain fr

1.	If Channel Length modulation is neglected, what is the voltage gain from the source to the drain for the CG stage shown below?(a) gm * Rd * {2Rs / (Rs + 1/gm)}(b) gm * Rd * {Rs / (Rs + 2/gm)}(c) gm * Rd * {2Rs / (Rs – 1/gm)}(d) gm * Rd * {Rs / (Rs + 1/gm)}The question was asked in an international level competition.This question is from MOSFET Amplifier with CG Configuration topic in chapter FET Amplifiers of Analog Circuits
Answer» The correct OPTION is (d) gm * Rd * {Rs / (Rs + 1/gm)} Easiest EXPLANATION: The voltage gain from the source of M1 to the drain of M1 can be found out from a SMALL signal analysis and it’ll turn out to be gm * Rd. But the input voltage is a result of the potential divider between Rs and 1/gm. Hence, the overall voltage gain is gm * Rd * {Rs/ (Rs + 1/gm)}.

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