Single-Ended Branch PA Characterisation for Outphasing Amplifiers

Paolo Enrico de Falco, K. Mimis, S. B. Smida, Kevin Morris, G. Watkins, A. Yamaoka, K. Yamaguchi
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引用次数: 3

Abstract

Back-off efficiency is a key requirement for load modulated power amplifier (PA) architectures such as Chireix outphasing. This paper studies the impact of second and third harmonic impedance tuning (Z2fo,Z3fo) on the performance of a 10 Watt GaN HEMT branch PA subject to outphasing-like load modulation, operating at 900 MHz. Performance variation of up to 3 dB output power (POUT) and 50% points drain efficiency (DE) with phase manipulation alone of Z2fo is recorded. Optimal Z2fo is revealed to vary - throughout a fixed and for different - outphasing trajectories. A simple technique is presented, using continuous class F−1closed form equations, which predicts the intrinsic optimal Z2fo for multiple points from five outphasing load trajectories, de-embedded to the current generator (CG) plane of the device.
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反相放大器的单端支路PA特性
回退效率是负载调制功率放大器(PA)架构(如Chireix失相)的关键要求。本文研究了二次和三次谐波阻抗调谐(Z2fo,Z3fo)对工作于900 MHz的10w GaN HEMT支路PA在类失相负载调制下性能的影响。记录了高达3db输出功率(POUT)和50%点漏极效率(DE)的性能变化,仅用Z2fo进行相位操作。最优Z2fo在一个固定的和不同的同相轨迹中是变化的。提出了一种简单的技术,使用连续类F−1闭形式方程,预测了从五个失相负载轨迹到器件电流发生器(CG)平面的多个点的内在最优Z2fo。
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