Suppressed-fundamental frequency three-way predistorter

摘要

A predistorter for use in transmission systems which employ power amplifiers, employing traveling wave tubes or field effect transistors. Since these active components present a nonlinear characteristic, which introduce amplitude and phase distortion in the amplified signal, the distorter circuit operates to subtract the distortion products from the output signal. In the present arrangement, the subtraction takes place before amplifying the signal by means of generation of distortion products which will present the same amplitude and opposite phase of those that will be generated by the power amplifier in order to obtain an undistorted and amplified signal.