基于负载调制平衡放大器的 GaN MMIC 双非对称朗格耦合器，用于提高后级效率

0 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE microwave and wireless technology letters Pub Date : 2024-07-08 DOI:10.1109/LMWT.2024.3420946

Luqi Yu;Yucheng Yu;Gaojing Zhang;Peng Chen;Chao Yu

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引用次数: 0

摘要

本文提出了一种基于双非对称朗格耦合器的负载调制平衡放大器（DALC-LMBA）拓扑结构，用于提高功率关断效率。输入非对称朗格耦合器 (ALC) 用于依次打开平衡放大器 (BA)，以提高功率关断效率；另一个输出 ALC 用于为所有三个晶体管生成适当的负载调制 (LM)。为了验证所提出的设计方法，在 0.12- $\mu $ m 氮化镓（GaN）工艺中实现了 23-25 GHz DALC-LMBA。它实现了 34-34.5 dBm 的饱和输出功率，功率附加效率（PAE）为 18%-20%，整个频带的 8-dB 衰减 PAE 为 14%-18%。当采用数字预失真技术的 200-MHz 7.2 分贝峰均功率比 5G 新无线电（NR）信号激励时，它可实现 14.4%-18% 的平均 PAE 和优于 -41 dBc 的相邻信道泄漏比（ACLR）。

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A GaN MMIC Dual-Asymmetrical-Lange-Coupler-Based Load-Modulated Balanced Amplifier for Back-Off Efficiency Enhancement

In this letter, a dual-asymmetrical-Lange-coupler-based load-modulated balanced amplifier (DALC-LMBA) topology is proposed for back-off efficiency enhancement. An input asymmetrical Lange coupler (ALC) is used to sequentially turn on the balanced amplifiers (BAs) for power back-off efficiency enhancement, another output ALC is adopted to generate proper load modulation (LM) for all three transistors. To verify the proposed design approach, a 23–25 GHz DALC-LMBA was implemented in a 0.12-

$\mu $

m gallium nitride (GaN) process. It achieves 34–34.5 dBm saturated output power with 18%–20% power-added-efficiency (PAE) and 14%–18% 8-dB back-off PAE across the band. When excited by a 200-MHz 7.2-dB peak-to-average power ratio 5G new radio (NR) signal with digital predistortion, it achieves 14.4%–18% average PAE and better than −41 dBc adjacent channel leakage ratio (ACLR).

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