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What does THD+N represent in higher order harmonic distortion?

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What does THD+N represent in higher order harmonic distortion?

(a) Noise

(b) Higher order distortion

(c) Higher order distortion with noise component

(d) Second order distortion with noise component

This question was addressed to me in semester exam.

This is a very interesting question from Higher-Order Harmonic Distortion in chapter Large Signal Amplifiers of Electronic Devices & Circuits

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Correct answer is (c) Higher order distortion with noise component

Explanation: THD+N represents the addition of all noise components to the fundamental frequency. Subsequently noise is also accounted for in this scale, hence it is better than the THD scale. The cause for noise being present in the amplifier output includes the power supply interference, RF interference, switching noises and many more.

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