Electronic Devices and Circuits - Engineering

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.