This paper presents a high-efficiency linear GaN K-band transmitter for broadband high peak-average power ratio (PAPR) signals. A GaN MMIC 18.5–24 GHz three-stage power amplifier with over 4 W peak output power, 20 dB saturated gain, and 40% peak PAE is supply-modulated with a four-level discrete dynamic supply GaN MMIC. For 100 MHz signals with ${\rm PAPR}\gt 10\, {\rm dB}$, we demonstrate an average efficiency improvement from 14 to 20% with a simultaneous linearity improvement in noise power ratio (NPR) from 23 to 26 dB through a shaping function focused on gain linearization. For 250 MHz signal bandwidth, there is no observed degradation in NPR and the efficiency is improved by 5 percentage points. For discrete supply modulation, the switching transients between levels are experimentally investigated for wideband signals.

中文翻译：

---

三级 K 波段 MMIC PA 的 100 和 250 MHz 离散电源调制的失真缓解

本文提出了一种用于宽带高峰均功率比 (PAPR) 信号的高效线性 GaN K 波段发射机。具有超过 4 W 峰值输出功率、20 dB 饱和增益和 40% 峰值 PAE 的 GaN MMIC 18.5–24 GHz 三级功率放大器使用四级分立动态电源 GaN MMIC 进行电源调制。对于 100 MHz 信号${\rm PAPR}\gt 10\, {\rm dB}$，我们展示了通过专注于增益线性化的整形功能，平均效率从 14% 提高到 20%，同时噪声功率比 (NPR) 的线性度从 23 dB 提高到 26 dB。对于 250 MHz 信号带宽，没有观察到 NPR 下降，效率提高了 5 个百分点。对于离散电源调制，对宽带信号的电平之间的切换瞬态进行了实验研究。