New Mixed-Mode Design Methodology for High-Efficiency Outphasing Chireix Amplifiers
New Mixed-Mode Design Methodology for High-Efficiency Outphasing Chireix Amplifiers
复制标题
DOI：
10.1109/tcsi.2018.2882770
复制
发表时间：
2019-04-01
影响因子：
5.1
通讯作者：
Barton, Taylor Wallis
中科院分区：
文献类型：
--
作者：
Chang, Hsiu-Chen;Hahn, Yunsik;Barton, Taylor Wallis
提出了一种为双输入F类移相Chireix放大器提供最佳混合模式工作的新设计方法。设计从本征I-V参考平面上的单晶体管F类模拟开始，以直接选择最佳峰值和回退阻性负载R-min和R-max以及输入RF栅极驱动器，从而实现效率和输出功率的最佳组合，而无需执行负载牵引模拟或测量。给出了仅用R-min和R-max表示的新的解析方程，用于在当前源参考平面上设计Chireix合并器。然后使用非线性嵌入来预测在封装参考平面上物理实现功率放大器(PA)所需的入射功率和多谐波源以及负载阻抗。本文给出了一个仅用R-min和R-max表示的解析公式，用于计算PA输入参考面上所需的峰值和退避离相角。利用两个15W GaN HEMT设计了一种Chireix外移功放。在1.9 GHz频率下，Chireix外移功放的峰值效率为72.58%，峰值功率为43.97 dBm，8分贝退避效率为75.22%。对峰值功率比为9.6-dB10-MHz的LTE信号进行了测试，在1.9 GHz下的平均漏极效率为59.4%，同时满足3GPP的线性度要求。
A new design methodology providing optimal mixed-mode operation for dual-input class-F outphasing Chireix amplifiers is presented. The design starts with single-transistor class-F simulations at the intrinsic I-V reference planes to directly select the optimal peak and backoff resistive loads R-min and R-max and input RF gate drives yielding the best combination of efficiencies and output powers without needing to perform a load pull simulation or measurement. New analytic equations expressed only in terms of R-min and R-max are given for designing the Chireix combiner at the current source reference planes. Nonlinear embedding is then used to predict the incident power and multi-harmonic source and load impedances required at the package reference planes to physically implement the power amplifier (PA). An analytic formula solely expressed in terms of R-min and R-max is reported for the peak and backoff outphasing angles required at the PA input reference planes. A Chireix outphasing PA is designed using two 15-W GaN HEMTs. A Chireix outphasing PA exhibits a peak efficiency of 72.58% with peak power of 43.97 dBm and a 8-dB backoff efficiency of 75.22% at 1.9 GHz. Measurements with 10-MHz LTE signals with 9.6-dB PAPR yield 59.4% average drain efficiency at 1.9 GHz while satisfying the 3GPP linearity requirements.