PA Efficiency and Linearity Enhancement Using External Harmonic Injection
PA Efficiency and Linearity Enhancement Using External Harmonic Injection
复制标题
使用外部谐波注入增强 PA 效率和线性度
DOI：
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发表时间：
2012
影响因子：
4.3
通讯作者：
Z. Popovic
中科院分区：
文献类型：
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作者：
A. Dani;M. Roberg;Z. Popovic
本文介绍了一种高效率的线性功率放大器（PA）的分析和实验演示与二次谐波注入在输出端。在该电路中，晶体管不会被强行驱动到压缩状态，并且不会产生显着的谐波含量。输出端的外部注入使电压和电流波形整形能够实现高效率。波形的理论分析表明，最大漏极效率为89.9%，与A类情况相比，输出功率最多减少0.13 dB。总功率放大器的效率是根据注入器电路的效率得出的。一个谐波注入的原型GaN HEMT 2.45-GHz PA表现出超过80%的效率与改善的线性度比AB类PA没有谐波注入。双音测量表明，三阶互调在线性区减少了-30 dBc，在饱和区减少了大于-10 dBc。
This paper presents analysis and experimental demonstration of a high-efficiency linear power amplifier (PA) with second-harmonic injection at the output. In this circuit, the transistor is not driven hard into compression and does not produce significant harmonic content. External injection at the output enables voltage and current wave-shaping to achieve high efficiency. Theoretical analysis of the waveforms shows that the maximal drain efficiency is 89.9% with, at most, 0.13 dB of reduction in output power compared with the class-A case. The overall PA efficiency is derived in terms of the injector circuit efficiency. A harmonically injected prototype GaN HEMT 2.45-GHz PA demonstrates over 80% efficiency with linearity improved over the class-AB PA without harmonic injection. Two-tone measurements show a reduction of the third-order intermodulation by -30 dBc in the linear region and greater than -10 dBc in saturation.