If M1 suffers from channel length modulation but M2 doesn’t, what is the voltage gain?(a) gm1 * Rd || 1/gm2 * gm2 * Rd2(b) gm1 * Rd || 1/gm2 * gm2 * 2Rd2(c) gm1 * Rd || 12/gm2 * gm2 * Rd2(d) gm1 * Rd * gm2 * Rd2I had been asked this question by my college professor while I was bunking the class.My question comes from MOSFET Amplifier with CG Configuration in portion FET Amplifiers of Analog Circuits

If M1 suffers from channel length modulation but M2 doesn’t, what is

1.	If M1 suffers from channel length modulation but M2 doesn’t, what is the voltage gain?(a) gm1 * Rd \|\| 1/gm2 * gm2 * Rd2(b) gm1 * Rd \|\| 1/gm2 * gm2 * 2Rd2(c) gm1 * Rd \|\| 12/gm2 * gm2 * Rd2(d) gm1 * Rd * gm2 * Rd2I had been asked this question by my college professor while I was bunking the class.My question comes from MOSFET Amplifier with CG Configuration in portion FET Amplifiers of Analog Circuits
Answer» RIGHT answer is (a) gm1 * Rd \|\| 1/gm2 * gm2 * Rd2 Explanation: The voltage gain due to M1 is gm1 * Rd \|\| 1/gm2 since we find that the drain of M1 is connected to the source of M2 and the impedance LOOKING into the source of a MOSFET is 1/gm2. Now, the voltage gain due to the 2ND CG STAGE is simply gm2Rd2. Hence, the total voltage gain is a product of both the factors ie gm1 Rd \|\| 1/gm2 * gm2 * Rd2.

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