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What is the unit of second harmonic distortion?

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What is the unit of second harmonic distortion?

(a) Ampere

(b) dBc

(c) Volts

(d) Watts

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This key question is from Second Harmonic Distortion in chapter Large Signal Amplifiers of Electronic Devices & Circuits

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Right option is (b) dBc

For explanation: The second order harmonic distortion is the ratio of second-order harmonic to the input signal or the carrier signal. It is measured as dBc. dBc is the power ratio of a signal to a carrier signal, expressed in decibels.

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