This study addresses an analogue method for mitigating the non-linearities introduced by discrete supply modulation of a high-efficiency power amplifier (PA). A 10 W two-stage X-band gallium–nitride monolithic microwave integrated circuit ( PA with a peak power-added efficiency of 55%, is tested with drain supply modulation from 10 to 20 V with an increase in efficiency and substantial degradation in linearity. In this work, the authors characterise the two-stage PA dynamically to develop shaping functions for both gate bias voltages. They demonstrate that gate modulation can improve back-off gain and linearity, specifically when gate biases of the two stages of a PA are independently modulated. Simultaneous gate and drain modulation results in 15 percentage point improvement in efficiency over a static supply, and a consistent improvement in noise power ratio over a static supply, for a 20 MHz noise-like signal. Results with a 20 MHz long-term evolution signal show comparable improvement in efficiency while maintaining adjacent channel power ratio near the level of the PA with a static supply.

中文翻译：

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通过同时进行栅极和漏极电源调制来提高两级X波段PA的效率和线性度

这项研究提出了一种减轻非线性的模拟方法，该非线性是由高效功率放大器（PA）的离散电源调制引起的。测试了10 W两级X波段氮化镓镓单片微波集成电路（峰值功率附加效率为55％的PA），其漏极电源调制范围为10至20 V，从而提高了效率，并且线性度大大降低在这项工作中，作者动态地表征了两级功率放大器，以开发出两个栅极偏置电压的整形函数，他们证明了栅极调制可以改善退避增益和线性度，特别是当功率放大器的两级栅极偏置为同时进行栅极和漏极调制，与静态电源相比，效率提高了15个百分点，对于类似20 MHz的噪声信号，与静态电源相比，噪声功率比得到了持续改善。使用20 MHz长期演进信号的结果表明，在保持静态电源的情况下，在将相邻信道功率比保持在PA电平附近的同时，效率得到了相当的提高。