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An amplifier uses ______ to take input signal.

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An amplifier uses ______ to take input signal.

(a) DC power

(b) AC power

(c) DC & AC power

(d) None of the mentioned

This question was addressed to me in semester exam.

This interesting question is from M-ary Modulation and Amplifiers topic in portion Modulation and Coding Trade-off of Digital Communications

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Correct choice is (a) DC power

To explain I would say: An amplifier uses DC power to take an input signal and increase its amplitude at the output.

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