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Which of the following is true about the common Source amplifier?(a) It has low input impedance(b) It has high output impedance(c) Infinite gain(d) Phase reversal voltage outputThe question was posed to me by my school teacher while I was bunking the class.This question is from The Common Source Amplifier topic in section Field-Effect Transistors of Electronic Devices & Circuits

Answer»

The correct answer is (d) Phase REVERSAL VOLTAGE output

The explanation is: If we CONSIDER a FIXED bias based amplifier, the voltage GAIN is Av=-gm RD,

The negative sign indicates that the voltage waveform is phase reversed by 180 degrees.



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