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The ratio of the RMS amplitude of the higher order harmonic frequencies to the RMS amplitude of the fundamental frequency is commonly called __________

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The ratio of the RMS amplitude of the higher order harmonic frequencies to the RMS amplitude of the fundamental frequency is commonly called __________

(a) Total harmonic power

(b) Total amplitude distortion

(c) Total frequency distortion

(d) Total harmonic distortion

I have been asked this question in a job interview.

Origin of the question is Distortion in Amplifier topic in division Power Amplifier of Analog Circuits

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The correct answer is (d) Total harmonic distortion

To explain: THD is the ratio of RMS amplitude of higher order harmonic frequencies to the RMS amplitude of the fundamental frequency. THD is expressed in percentage.

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