Question

A sinusoidal signal has 1.5V at t=2S, If this signal is given to Common source amplifier with |Av|=5V, what will be its output at t=2S?

(a) 7.5V

(b) -7.5V

(c) 0

(d) 15V

I got this question in final exam.

This question is from The Common Source Amplifier topic in division Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

The correct option is (b) -7.5V

Explanation: Input at t=2S is 1.5V, |Av|=5V=> output=5×1.5V=7.5V,

But amplifier produces 180 degree phase-shift => output=-7.5V.