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What is the correct phase shift in CE amplifier?(a) 45 degrees(b) 180 degrees(c) 60 degrees(d) 120 degreesThe question was posed to me in a national level competition.My question is from CE Amplifier with an Emitter Resistance topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The correct option is (b) 180 degrees

To explain I would say: The negative ALTERNATION of an AC signal will CAUSE a decrease in the base current.This action then causes a CORRESPONDING decrease in EMITTER current through RL(load). The output signal of a common- emitter AMPLIFIER is therefore 180 degrees out of phase with the input signal.



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