Semiconductors: Common Emitter Amplifier — Phase MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Common Emitter Amplifier — PhaseEasyQuestion 20237

Question

In a common-emitter amplifier, the output voltage is:

A
In phase with input
B
180° out of phase with input
Correct
C
90° out of phase
D
At double the frequency

Correct answer

180° out of phase with input

Explanation

In CE configuration: increasing V_in → increasing I_B → increasing I_C → increasing V_CE drop across R_C → decreasing output V_CE. So output decreases when input increases → 180° phase inversion.

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