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Field Effect Transistors (FET) - Technical MCQs

Q1:

When an input delta of 2 V produces a transconductance of 1.5 mS, what is the drain current delta?

A 666 mA

B 3 mA

C 0.75 mA

D 0.5 mA

ANS:B - 3 mA

Transconductance(gm)= Del( ID) /Del( VGS)
and also Transconductance is reciprocal of resistance so we no that Resistance =V/I.
so transcondustance=I/V.
Then you will found 3mA.