If channel length modulation is present, what is the impedance looking into node X?(a) (1/gm2 || ro2 || 1/gm1)(b) (1/gm2 || 1/gm1 || ro1)(c) (1/gm2 || ro2 || 12/gm1 || ro1)(d) (1/gm2 || ro2 || 1/gm1 || ro1)I had been asked this question in an internship interview.The question is from MOSFET Amplifier with CD Configuration topic in portion FET Amplifiers of Analog Circuits

If channel length modulation is present, what is the impedance looking

1.	If channel length modulation is present, what is the impedance looking into node X?(a) (1/gm2 \|\| ro2 \|\| 1/gm1)(b) (1/gm2 \|\| 1/gm1 \|\| ro1)(c) (1/gm2 \|\| ro2 \|\| 12/gm1 \|\| ro1)(d) (1/gm2 \|\| ro2 \|\| 1/gm1 \|\| ro1)I had been asked this question in an internship interview.The question is from MOSFET Amplifier with CD Configuration topic in portion FET Amplifiers of Analog Circuits
Answer» The correct option is (d) (1/gm2 \|\| ro2 \|\| 1/gm1 \|\| ro1) The best explanation: The SOURCE of M1 and M2 are connected at NODE X. The impedance LOOKING into the source of a MOSFET is (1/gm \|\| ro). If we look at node X, M1 and M2 are connected from Node X to ground. Hence, they are parallel to each other and the OVERALL impedance becomes (1/gm2 \|\| ro2 \|\| 1/gm1 \|\| ro1).

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