Harmonic Distortions in Power Amplifiers

HARMONIC DISTORTION IN POWER AMPLIFIERS

A good amplifier should not only give an enlarged version of the input signal at the output, but should also provide a faithful reproduction of the input waveforms.

One type of distortion that is common to most of the amplifiers is called amplitude or harmonic distortion, which is caused due to nonlinearity of the active device employed for amplification.

The active device used for amplification may not increase equally all portions of the input signal over its positive and negative excursions.

Harmonic distortion increases as we go from Class A Power amplifier
to Class C power amplifier operations.

Harmonic distortion occurs even in Class A Operation.

SECOND HARMONIC DISTORTION

The second Harmonic distortion is the percent of the second harmonic component present in the output current waveform with respect to the amount of fundamental component


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Reference:-
J.B Gupta
Electronic Devices and Circuits