Novel Outphasing Power Amplifiers Designed With an Analytic Generalized Doherty-Chireix Continuum Theory
Novel Outphasing Power Amplifiers Designed With an Analytic Generalized Doherty-Chireix Continuum Theory
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采用解析广义 Doherty-Chireix 连续体理论设计的新型异相功率放大器
DOI：
10.1109/tcsi.2019.2910471
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Chang, Hsiu-Chen
中科院分区：
文献类型：
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作者：
Liang, Chenyu;Roblin, Patrick;Hahn, Yunsik;Popovic, Zoya;Chang, Hsiu-Chen
给出了一个统一处理的双输入输出相位功率放大器的解析理论，包括Doherty模和Chireix模的功率合成的解的连续体。在电流源参考平面上发展的这一统一理论揭示了所有可能的功率放大器(PA)合并器在解的连续统内实现的性能权衡。此外，它还确定了一种新型的双输入混合Chireix-Doherty功率放大器，它结合了Doherty和Chireix运算的关键特性，从而使施加到主晶体管和辅助晶体管的基极漏极电压保持恒定。这种混合型功放依靠随输入功率电平变化的输入离相角来获得正确的负载调制行为。采用非线性嵌入的方法实现了2 GHz双输入混合Chireix-Doherty功放，并进行了实验验证。在连续波(CW)测量中，获得了9dB退避功率下61%的漏极效率和约43dBm的最大输出功率。与用于比较的Doherty功率放大器不同，效率随输出功率单调增加。在峰值平均功率比(PAPR)为9.5d B的20 MHz LTE信号激励下，双输入功率放大器线性化后的平均漏电效率为60.0%，邻道漏电比(ACLR)为-48.1 dBc。
An analytic theory for dual-input outphasing power amplifiers that incorporate in one unified treatment, the continuum of solutions for power combining including the Doherty and Chireix modes is presented. This unified theory developed at the current-source reference planes reveals the performance trade-off achieved by all of the possible power amplifier (PA) combiners within the continuum of solutions. Furthermore, it identifies a novel type of dual-input hybrid Chireix-Doherty PA that combines key features of the Doherty and Chireix operations such that the fundamental drain voltages applied to both the main and auxiliary transistors remain constant. This hybrid PA relies on an input outphasing angle varying with the input power level to obtain the correct load modulation behavior. A 2-GHz dual-input hybrid Chireix-Doherty PA is implemented using nonlinear embedding and experimentally evaluated to validate the theory. A drain efficiency of 61% at 9-dB backoff power and a maximum output power of about 43 dBm are obtained for continuous-wave (CW) measurements. The efficiency increases monotonously with output power unlike that of the Doherty PA used for comparison. When excited with a 20-MHz LTE signal with 9.5-dB peak-to-average power ratio (PAPR), the dual-input PA yields a 60.0% average drain efficiency and -48.1-dBc adjacent-channel power-leakage ratio (ACLR) after linearization.