Title :
Predistortion Linearization of an X-Band TWTA for Communications Applications
Author :
Hu, Xin ; Wang, Gang ; Wang, Zi-Cheng ; Luo, Ji-Run
Author_Institution :
R&D Center for High Power Microwave Device, Chinese Acad. of Sci., Beijing, China
fDate :
6/1/2011 12:00:00 AM
Abstract :
Using a predistortion linearizer is an important way to improve traveling-wave tube amplifier (TWTA) linearity. However, predistortion linearizers cannot usually control amplitude modulation (AM)/AM and AM/phase modulation (PM) conversion separately, so it is difficult to satisfy linearization requirements for AM/AM and AM/PM conversion simultaneously. This paper proposes a predistortion linearizer with a relatively simple circuit structure, which provides good control of gain expansion over the input power dynamic range while keeping the amount of phase expansion small. Good linearity improvement has been obtained for a 45-W X-band TWTA with this predistortion linearizer.
Keywords :
amplitude modulation; linearisation techniques; microwave amplifiers; phase modulation; travelling wave amplifiers; AM/AM conversion; AM/PM conversion; TWTA for Communications Applications; X-band; amplitude modulation; frequency 45 GHz; gain expansion; phase modulation; predistortion linearization; traveling-wave tube amplifier; Dynamic range; FETs; Gain; Logic gates; Power generation; Predistortion; Schottky diodes; Expansion of gain and phase; nonlinear distortion; predistortion linearizer; traveling-wave tube amplifier (TWTA);
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2011.2128321
