If both the MOSFET’s are identical and have channel length modulation, what is the output impedance at node S?(a) R1 || ro1 || ro2(b) R1 + (ro1 || ro2)(c) R1 + (ro1 + ro2)(d) R1 || (ro1 + ro2)I had been asked this question in homework.This interesting question is from MOSFET Amplifier with CS Configuration topic in division FET Amplifiers of Analog Circuits

If both the MOSFET’s are identical and have channel length modulatio

1.	If both the MOSFET’s are identical and have channel length modulation, what is the output impedance at node S?(a) R1 \|\| ro1 \|\| ro2(b) R1 + (ro1 \|\| ro2)(c) R1 + (ro1 + ro2)(d) R1 \|\| (ro1 + ro2)I had been asked this question in homework.This interesting question is from MOSFET Amplifier with CS Configuration topic in division FET Amplifiers of Analog Circuits
Answer» Correct answer is (a) R1 \|\| ro1 \|\| ro2 Easiest explanation: If we perform a small signal ANALYSIS at node S, we will find that three resistors are connected from node S to ground. They are R1, and the resistances appearing between source and DRAIN of the MOSFET’s DUE to channel length MODULATION ie ro1 and ro2. Hence, the output resistance is R1 \|\| ro1 \|\| ro2.

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