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Why a class D amplifier is called as switching amplifier?

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Why a class D amplifier is called as switching amplifier?

(a) Because it consists of a transistor

(b) Because of high power

(c) Because of less noise effect

(d) Because of binary switch

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Question is taken from Class D Amplifiers topic in division Power Amplifiers of Electronic Devices & Circuits

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The correct answer is (d) Because of binary switch

The explanation: A class D amplifier or switching amplifier is an electronic amplifier where all power devices are operated as binary switches.

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