Practical Load Compensation Networks in Chireix Outphasing Amplifiers Using Offset Transmission Lines

A. Bogusz, J. Lees, R. Quaglia, G. Watkins, S. Cripps
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引用次数: 7

Abstract

This paper describes a load compensation network in an outphasing system, realized using series transmission lines instead of conventional shunt reactive components. In particular, it is shown that using transmission lines of different lengths, here referred as Offset Transmission Lines (OTL), can provide load compensation effects at the intrinsic plane of a real device, close to those proposed by Chireix when using shunt reactance in an ideal case. The concept is analysed and demonstrated using a dedicated outphasing circuit, based on GaN HEMT packaged devices. At 2 GHz, the prototype amplifier maintains an efficiency greater than 50% over an output power back-off range in excess of 8 dB. Drain efficiencies of more than 65% and 40% are maintained over 5.5dB and 10dB output power ranges respectively, while achieving a maximum combined output power of 44.5 dBm.
采用偏置传输线的Chireix共相放大器的实用负载补偿网络
本文介绍了一种用串联传输线代替传统的并联无功元件实现的缺相系统负荷补偿网络。特别是,本文表明,使用不同长度的传输线,这里称为偏置传输线(OTL),可以在实际设备的本构面提供负载补偿效果,接近Chireix在理想情况下使用并联电抗时提出的效果。使用基于GaN HEMT封装器件的专用失相电路对该概念进行了分析和演示。在2ghz时,原型放大器在超过8db的输出功率回退范围内保持50%以上的效率。在5.5dB和10dB输出功率范围内,漏极效率分别保持在65%和40%以上,同时最大组合输出功率为44.5 dBm。
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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