Active load modulation and harmonic injection can be used to boost the power amplifier's (PA) efficiency, but these techniques must add a fundamental external source or a harmonic generator. In this paper, a two‐way power amplifier architecture is introduced to extend high‐efficiency operation bandwidth by utilizing concurrent active load modulation with a waveform mapping method. Active load modulation is realized in between the two branches with the aid of independent input amplitude and phase control. Based on a calculated waveform database, high‐efficiency operations for both transistors from 1 to 4 GHz are designed in a self‐defined optimization platform considering waveform distance and input parameters. Finally, this PA is fabricated and measured to offer 41.6 to 45.0 dBm power, 8.2 to 11.7 dB gain, and 56% to 89% drain efficiency from 0.85 to 3.85 GHz.

中文翻译：

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具有双向并发有源负载调制方法的1至4 GHz宽带高效功率放大器的设计

有源负载调制和谐波注入可用于提高功率放大器（PA）的效率，但是这些技术必须添加基本的外部源或谐波发生器。本文介绍了一种双向功率放大器架构，该架构通过利用并发有源负载调制和波形映射方法来扩展高效工作带宽。借助于独立的输入幅度和相位控制，在两个分支之间实现了有源负载调制。基于计算的波形数据库，在一个自定义优化平台中设计了从1到4 GHz的两个晶体管的高效工作，该平台考虑了波形距离和输入参数。最后，制造并测量该功率放大器以提供41.6至45.0 dBm的功率，8.2至11.7 dB的增益，