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A FETcircuit has a transconductance of 2500 µ seconds and drain resistance equals to 10Kohms than voltage gain will be __________(a) 20(b) 25(c) 30(d) 35This question was posed to me during an interview.My question is from A Generalized FET Amplifier in division Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Correct OPTION is (b) 25

To explain I WOULD say: The TRANSCONDUCTANCE, gm is defined as

gm = ΔID / ΔVGS

so gm = Voltage gain / RD

Therefore, voltage gain = gm * RD

=2500*10^-6 * 10 * 10^3

= 25.



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