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Harmonic Multiplication in Linear Devices

Nice work! Just bear in mind that multiplication due to feedback cannot occur unless there is finite open-loop distortion present within the device or circuit. As Baxandall demonstrates in his Dec '78 WW article, feedback acts to recirculate the inherent harmonic products present within the open-loop amplifier. Each circulation intermodulates with the inherent products to produce higher-order products.

We know, however, that a linear device produces zero harmonic distortion products (this by definition); a linear device therefore contains no inherent products to modulate; thus feedback around a linear device produces no multiplication. In short, feedback is not the root problem--the root problem is device nonlinearity.



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