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Find the transconductance when applied gate to source voltage is -2V.

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Find the transconductance when applied gate to source voltage is -2V.

(a) 10 Ω^-1

(b) 10mΩ^-1

(c) 40mΩ^-1

(d) 20mΩ^-1

This question was addressed to me in exam.

The above asked question is from JFET Amplifier in section FET Amplifiers of Analog Circuits

1 Answer

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Right choice is (b) 10mΩ^-1

Explanation: VP = -4V

gm = gmo (1 – VGS/VP) = 20 (1-2/4) = 20/2 = 10mΩ^-1.

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