If channel length modulation is neglected, what is the overall voltage gain of the following circuit?(a) – {gm1 * (Rd || 1/gm2) * (Rd1/ (1/gm2 + Rd))}(b) – {gm1 * (Rd || 1/gm2) * gm2 * 2Rd1}(c) – {gm1 * Rd * gm2 * Rd1}(d) – {gm1 * 1/gm2 * gm2 * Rd1}The question was posed to me during a job interview.Origin of the question is MOSFET Amplifier with CG Configuration in division FET Amplifiers of Analog Circuits

If channel length modulation is neglected, what is the overall voltage

1.	If channel length modulation is neglected, what is the overall voltage gain of the following circuit?(a) – {gm1 * (Rd \|\| 1/gm2) * (Rd1/ (1/gm2 + Rd))}(b) – {gm1 * (Rd \|\| 1/gm2) * gm2 * 2Rd1}(c) – {gm1 * Rd * gm2 * Rd1}(d) – {gm1 * 1/gm2 * gm2 * Rd1}The question was posed to me during a job interview.Origin of the question is MOSFET Amplifier with CG Configuration in division FET Amplifiers of Analog Circuits
Answer» Right answer is (a) – {gm1 * (Rd \|\| 1/gm2) * (Rd1/ (1/gm2 + Rd))} Explanation: This is a cascade of CS stage PRECEDING a CG stage. The voltage gain of the first stage is – (gm1 * Rd \|\| 1/gm2). This is because the drain of M1 is connected to the SOURCE of M2 and the IMPEDANCE looking into the source of M2 is 1/gm2. Now, the source of the CG stage is connected to Rd and hence the voltage gain due to this stage is AFFECTED by source degeneration and the voltage gain is Rd1/ (1/gm2 + Rd). The overall voltage gain is – {gm1 * (Rd \|\| 1/gm2) * (Rd1/ (1/gm2 + Rd))}.

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