JEE Main · PhysicsEasy
In a common emitter transistor amplifier, the output signal is
- A.in phase with the input
- B.out of phase with the input by 90 degrees
- C.out of phase with the input by 180 degrees
- D.out of phase with the input by 270 degrees
Show correct answer & step-by-step solution
Correct answer: C — out of phase with the input by 180 degrees
Solution
- In a common emitter amplifier, the input signal is applied between the base and emitter.
- The output signal is taken across the collector and emitter.
- Due to the nature of the transistor operation in this configuration, the output voltage is inverted relative to the input.
- This inversion corresponds to a phase shift of .
- Hence the answer is (C).
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