Dielectric Waveguide Including a Tapered Wave Absorber
John R. Grebliunas, Arnold Berman, David L. Crampton · 1997
A predistortion linearizer ( ) and method for distorting an ac input signal ( ) to a power amplifier ( ) provide a distortion to the input signal which is complementary to a distortion in terms of gain and phase, introduced by the power amplifier as a function of signal amplitude, thereby to linearize the power amplifier. The linearizer includes a switching circuit ( ,Z , ,Z ) having an input terminal ( ) and an output terminal ( ) and a pair of antiparallel diodes ( , ) connected between the input terminal and the output terminal of the switching circuit. The linearizer has also an impedance circuit Z comprising solely passive electrical elements connected between the input terminal and the output terminal of the switching circuit, wherein elements of the impedance circuit have values selected to introduce the complementary distortion to the input signal as a function of amplitude of the input signal to linearize the power amplifier. 14 Claims, 2 Drawing Sheets