无线通信功率放大器的效率和线性度改进

GaAs IC Symposium. IEEE Gallium Arsenide Integrated Circuit Symposium. 20th Annual. Technical Digest 1998 (Cat. No.98CH36260) Pub Date : 1998-11-01 DOI:10.1109/GAAS.1998.722610

P. Asbeck, P.F. Chen, L. Larson

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引用次数: 25

摘要

限制无线通信功率放大器功率效率的一个关键问题是必须适应信号电平的变化。本文讨论了使放大器直流电流和电源电压随信号电平变化的重要性和技术。介绍了一种采用GaAs hbt实现的3.3 V源高速DC-DC变换器。使用该DC-DC转换器的2 GHz功率放大器的效率比is -95 CDMA系统的信号功率变化特性平均提高了40%。

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Efficiency and linearity improvement in power amplifiers for wireless communications

A key issue limiting power efficiency in wireless communication power amplifiers is the variation in signal level that must be accommodated. This paper discusses the importance of and techniques for varying the amplifier DC current and power supply voltage as a function of signal level. A high speed DC-DC converter operating from a 3.3 V source, implemented with GaAs HBTs, is described. The efficiency of a 2 GHz power amplifier using the DC-DC converter is shown to increase by 40%, averaged over signal power variations characteristic of IS-95 CDMA systems.

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GaAs IC Symposium. IEEE Gallium Arsenide Integrated Circuit Symposium. 20th Annual. Technical Digest 1998 (Cat. No.98CH36260)

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