1.

For a self bias amplifier, RS=RD, the output will be_________________(a) Same as Input(b) Same as input but phase reversed(c) 0(d) InfiniteI had been asked this question by my college director while I was bunking the class.My doubt stems from The Common Source Amplifier topic in division Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Correct choice is (b) Same as input but phase reversed

The best I can EXPLAIN: Av=-gm RD/ (1+gm RS),

If RS=RD, Av=-gm RD/ (1+gm RD) => Avis NEARLY EQUAL to -1Av=Vo/Vi=> Vo=-Vi.



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