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Electronic Devices and Circuits

Q1: Which one of the following gain equations is correct for a MOSFET common-source amplifier?
(gm is mutual conductance, and RD is load resistance at the drain)

A AV = gm/(1 - RD)

B AV = gm/RD

C AV = gm/(1 + RD)

D AV = RD/gm

ANS:B - AV = gm/RD

It should be Av = gm*Rd.



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