If g is the transconductance, r is the resistance due to channel length modulation and if M2 has channel length modulation but M1 and M3 doesn’t, what is the total resistance at the source of M2?

If g is the transconductance, r is the resistance due to channel leng

1.	If g is the transconductance, r is the resistance due to channel length modulation and if M2 has channel length modulation but M1 and M3 doesn’t, what is the total resistance at the source of M2?
A.	(1/ g \|\| R) \|\| (1/g \|\| r)
B.	(1/ g) \|\| (1/g \|\| r)
C.	R \|\| (1/g \|\| r)
D.	(1/ g \|\| R) \|\| 1/g
Answer» B. (1/ g) \|\| (1/g \|\| r)

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If g is the transconductance, r is the resistance due to channel length modulation and if M2 has channel length modulation but M1 and M3 doesn’t, what is the total resistance at the source of M2?

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