Design of an S-Band Chireix Outphasing Power Amplifier Based on a Systematic Bandwidth Limitation Analysis

A. Piacibello, R. Quaglia, Marco Pirolaf, S. Cripps
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引用次数: 11

Abstract

This work aims at assessing the factors that limit the bandwidth of a dual input Chireix outphasing PA based on a packaged commercial GaN device. To evaluate the effects of device parasitics, compensation elements and power combiner on the bandwidth we consider several output sections of increasing complexity. Their input impedances, at the back-off level of interest, are evaluated and referred to that of the ideal, frequency independent case. The comparison of the analyzed output sections reveals that the device parasitics limit the amplifier bandwidth more than output power combiner and compensation elements. Based on such conclusion, a dual input hybrid Chireix PA for LTE operation is designed and optimized for best efficiency at 7 dB back-off in the 3.1–3.7 GHz range. Measurements report back-off drain efficiency and PAE of 50% and 41% at center frequency, and performance within 10% of the maximum is maintained over more than 200 MHz.
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基于系统带宽限制分析的s波段Chireix同相功率放大器设计
这项工作旨在评估限制基于封装的商用GaN器件的双输入Chireix淘汰PA带宽的因素。为了评估器件寄生、补偿元件和功率合成器对带宽的影响,我们考虑了几个日益复杂的输出部分。它们的输入阻抗,在感兴趣的回退水平,被评估并参考理想的,频率无关的情况。通过对分析输出段的比较,发现器件寄生比输出功率合成器和补偿元件对放大器带宽的限制更大。基于上述结论,设计并优化了用于LTE操作的双输入混合型Chireix PA,以在3.1-3.7 GHz范围内实现7 dB回退的最佳效率。测量结果显示,在中心频率下,回泄效率和PAE分别为50%和41%,在200 MHz以上的频率下,性能保持在最大值的10%以内。
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