高效线性功率放大器，用于3.5伏NADC蜂窝应用

Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI:10.1109/RAWCON.1998.709199

J. Staudinger, G. Norris, R. Sherman, G. Sadowniczak

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引用次数: 1

摘要

为使用3.5伏电池的北美数字蜂窝(NADC)移动无线电话开发了一种高效的线性功率放大器。该放大器由两个级联增益级组成，在大于1 W的输出功率下实现25 dB增益，在IS-136规定的ACPR线性水平下相应的功率增加效率为50%。该放大器使用GaAs PHEMT器件实现，在优化该数字调制格式的效率/线性权衡方面提供卓越的性能。通过将大部分电路放在单个GaAs集成电路上，可以最小化放大器的尺寸。一个例外是输出匹配电路，其中选择高Q集总元件以最小化损耗。电路拓扑的选择基于一种设计方法，其中PHEMT器件的大信号模型与行为分析技术相结合，从而模拟放大器对/spl pi//4 DQPSK调制信号的性能。这种方法被证明在FET器件的尺寸上是成功的，并检查了使用选定的基频和谐波终端所提供的性能改进。

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Highly efficient linear power amplifier for 3.5 volt NADC cellular applications

A highly efficient linear power amplifier has been developed for North American Digital Cellular (NADC) mobile radio telephones operating with 3.5 volt batteries. The amplifier consists of two cascaded gain stages to achieve 25 dB gain at greater than 1 W output power with a corresponding power added efficiency of 50% at IS-136 specified ACPR linearity levels. The amplifier is realized using GaAs PHEMT devices to provide superior performance in optimizing the efficiency/linearity trade-off for this digital modulation format. Size of the amplifier is minimized by placing most of the circuitry on a single GaAs IC. An exception is the output matching circuitry where high Q lumped elements are selected to minimize loss. The circuit topology is chosen based on a design methodology where a large signal model of the PHEMT device is combined with behavior analysis techniques such that performance of the amplifier is simulated for a /spl pi//4 DQPSK modulated signal. This approach proved successful in sizing the FET devices as well as examining the performance improvements offered in using selected fundamental and harmonic terminations.

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Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)

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