Title :
Amplifier linearization using simultaneous harmonic and baseband injection
Author :
Fan, Chun-Wah ; Cheng, Kwok-Keung M.
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, China
Abstract :
A novel linearization scheme utilizing injection of distortion signal at the input of amplifier is described. Harmonic and baseband signal generated by predistortion circuits is fed to the input of the main amplifier and by controlling the power level of the harmonic and baseband signal properly, mixing products can be made to cancel out with the FET inherent distortion signals. Unlike many other techniques, no precise phase adjustment is required for the RF signal path. For verification, the two-tone performance of a constructed linearized amplifier is measured and a reduction of the third-order IMD power level of about 27 dB is observed.
Keywords :
intermodulation distortion; linearisation techniques; microwave amplifiers; RF signal; baseband injection; harmonic injection; linearization; microwave amplifier; mixing product; power level control; predistortion circuit; third-order intermodulation distortion; two-tone characteristics; Baseband; Circuits; Distortion; FETs; Power amplifiers; Power generation; Power system harmonics; Predistortion; Radiofrequency amplifiers; Signal generators;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/7260.959309
