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Which type of amplifier uses pulse (digital) signals in its operation?

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Which type of amplifier uses pulse (digital) signals in its operation?

(a) Class A

(b) Class B or AB

(c) Class C

(d) Class D

This question was addressed to me in unit test.

I need to ask this question from Classification of Output Stages in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct choice is (d) Class D

To explain I would say: The class D amplifier is nonlinear switching amplifiers or pulse width modulation amplifiers. These amplifiers are called as digital amplifiers.

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