A source modulated amplifier in GaN designed for baseband PWM and direct filter connection

2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom) Pub Date : 2014-05-27 DOI:10.1109/BlackSeaCom.2014.6849034

David Seebacher, C. Schuberth, P. Singerl, M. Gadringer, W. Bösch

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引用次数: 1

Abstract

To cope with the increasing demand for bandwidth in wireless communications coding schemes with high crest factors are employed. As a result the power amplifier (PA) is operated far below maximum output power for most of the time, leading to low average efficiency in traditional designs. Therefore PA concepts providing efficiency enhancement in back off are key for efficient transmitters. Baseband PWM operated PAs in combination with direct filter connection are possible candidates. Due to the constant current of the used filters special PA structures are required. The proposed source modulated amplifier offers these properties. Its general operational principle is presented and an implementation study in a GaN MMIC process was carried out. The designed PA operates at 2.65 GHz delivering a maximum output power of 3W. To get optimum performance of the direct filter connection a codesign of the PA and the cavity filter included in the output matching network was performed, resulting in a compact solution.

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一种用于基带PWM和直接滤波器连接的GaN源调制放大器

为了应对无线通信中对带宽日益增长的需求，采用了高波峰因数的编码方案。其结果是，功率放大器(PA)在大多数时间远低于最大输出功率工作，导致传统设计的平均效率低。因此，PA概念提供了效率的提高，在回退是关键的高效发射机。基带PWM操作的放大器与直接滤波器连接的组合是可能的候选人。由于所用滤波器的电流恒定，需要特殊的PA结构。所提出的源调制放大器具有这些特性。介绍了它的一般工作原理，并在GaN MMIC工艺中进行了实现研究。设计的PA工作频率为2.65 GHz，最大输出功率为3W。为了获得直接滤波器连接的最佳性能，对输出匹配网络中包含的PA和腔滤波器进行了协同设计，得到了一个紧凑的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)

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