If channel length modulation is present. what is the overall output impedance of the following CG stage?(a) Rd || {Rs*(1+gm * ro) + ro}(b) Rd || {Rs*(1+gm * ro) + 2ro}(c) Rd || {Rs*(1+gm * ro) – ro}(d) Rd || {Rs*(2+gm * ro) + ro}I had been asked this question by my college director while I was bunking the class.This interesting question is from MOSFET Amplifier with CG Configuration topic in division FET Amplifiers of Analog Circuits

If channel length modulation is present. what is the overall output im

1.	If channel length modulation is present. what is the overall output impedance of the following CG stage?(a) Rd \|\| {Rs(1+gm ro) + ro}(b) Rd \|\| {Rs(1+gm ro) + 2ro}(c) Rd \|\| {Rs(1+gm ro) – ro}(d) Rd \|\| {Rs(2+gm ro) + ro}I had been asked this question by my college director while I was bunking the class.This interesting question is from MOSFET Amplifier with CG Configuration topic in division FET Amplifiers of Analog Circuits
Answer» Correct option is (a) Rd \|\| {Rs(1+gm RO) + ro} EASY explanation: The impedance LOOKING into the drain of M1 would be similar to that of a CS stage with source degeneration. That implies the impedance isRs(1+gm ro) + ro. But this impedance is parallel to Rd. Hence, the OVERALL output impedance becomes Rd \|\| {Rs(1+gm ro) + ro}.

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