Linearity analysis of a 40 W class-G-modulated microwave power amplifier
Linearity analysis of a 40 W class-G-modulated microwave power amplifier
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40 W G 类调制微波功率放大器的线性分析
DOI：
10.1109/eumic.2015.7345145
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
W. Heinrich
中科院分区：
文献类型：
--
作者：
N. Wolff;O. Bengtsson;Martin Schmidt;M. Berroth;W. Heinrich
本文介绍了一种G类功率放大器。它包括一个分立的G类电源调制器，使用GaN-HEMT进行开关，连接到一个峰值功率为40 W的2.65 GHz功率放大器，专为G类电源调制而设计。本文的重点是评估这个系统的RF和开关信号，开关行为和线性度。使用复记忆多项式数字预失真器和查找表以及G类优化数字预失真器模型的组合来改善功率放大器的线性度。发现G类调制将总体PAE提高了10- 15%。结果表明，采用专用的数字预失真器，可以显著降低调制器引起的线性失真。
In this paper, a class-G power amplifier is presented. It consists of a discrete class-G supply modulator, which uses a GaN-HEMT for switching, connected to a 2.65 GHz power amplifier with 40 W peak power, specifically designed for class-G supply modulation. The focus of the paper is on evaluating this system in terms of the RF and the switching signal, the switching behavior, and linearity. A combination of a complex memory polynomial digital predistorter and lookup tables as well as class-G-optimized digital predistorter models is used to improve the linearity of the power amplifier. It is found that the Class-G modulation improves overall PAE by 10-15 %. It is shown that using dedicated digital predistortion the linearity the distortions caused by the modulator can be significantly reduced.