1.

Voltage gain of common drain amplifier is always slightly less than _____(a) 0.5(b) 1(c) 1.5(d) 2I got this question during an online exam.The origin of the question is A Generalized FET Amplifier in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right choice is (b) 1

For explanation I WOULD SAY: In common drain amplifier

Writing KCL at the SOURCE NODE ;

Gm(vin – vout) – gmbs vout – gds vout = 0

 vout vin = Gm / Gm + Gmbs + gds

Therefore gain is less than one.



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