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Choose the incorrect statement for JFET(s).(a) Maximum transconductance occurs at VGS=0(b) Transconductance decreases linearly with VGS(c) Transconductance increases linearly with IDS(d) Transconductance does not depend on VDSThe question was posed to me in an interview for internship.I would like to ask this question from JFET Amplifier topic in chapter FET Amplifiers of Analog Circuits

Answer»

The correct choice is (c) Transconductance increases linearly with IDS

The BEST explanation: Maximum transconductance OCCURS at VGS = 0, and it lies between 0-gmo. Transconductance decreases linearly with VGS according to equation gm = gmo(1-VGS/VP). However, gm ∝ \(\SQRT{I_{DS}}\), which is a parabolic increase, not LINEAR.



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