A novel design method for extending power back-off range of broadband Doherty power amplifier
A novel design method for extending power back-off range of broadband Doherty power amplifier
复制标题
一种扩展宽带Doherty功率放大器功率回退范围的新颖设计方法
DOI：
10.1002/mop.31909
复制
发表时间：
2019
影响因子：
1.5
通讯作者：
Yao Yao
中科院分区：
文献类型：
--
作者：
Jin Yi;Dang Ni;Yang Guangwen;Li Mingyu;Yang Zhenxing;Yao Yao
本文提出了一种扩展Doherty功率放大器（DPA）输出回退（OBO）范围的新设计方法。详细分析了峰化功率放大器和载波功率放大器的功率比对DPA带宽的影响。利用所提出的理论，可以对特定OBO范围的DPA的带宽进行简化估计。设计了一个工作在1.8 ~ 2.6 GHz（33%相对带宽）、具有9 dB OBO电平的宽带高效DPA来验证所提出的方法。根据测量结果，DPA实现了44.6到46.8 dBm的饱和输出功率和61%到74%的漏极效率（DE）。在9dB OBO电平下，工作频带内的DE值在50%~ 63%之间变化。数字预失真（DPD）测试结果表明，线性化后的DPA能够满足现代无线通信系统的频谱要求。
In this article, a novel design method for extending the output back‐off (OBO) range of the Doherty power amplifier (DPA) is proposed. The influence of the power ratio of the peaking and carrier power amplifier on the bandwidth of the DPA is analyzed in detail. With the proposed theory, the simplified estimation of the bandwidth of the DPA for a specific OBO range can be carried out. A broadband high‐efficiency DPA working from 1.8 to 2.6 GHz (33% relative bandwidth) with 9 dB OBO level is designed to verify the proposed method. According to the measured results, the DPA achieves 44.6 to 46.8 dBm saturation output power and drain efficiency (DE) of 61% to 74%. And at 9 dB OBO level, the DE varies from 50% to 63% over the operation band. Furthermore, digital predistortion (DPD) measurement results show that the linearized DPA can meet the spectral requirements for modern wireless communication systems.