A Watt-Level Quadrature Switched/Floated-Capacitor Power Amplifier with Back-Off Efficiency Enhancement in Complex Domain Using Reconfigurable Self-Coupling Canceling Transformer

📋 论文概要

本文提出了一种瓦特级正交开关/浮空电容功率放大器，通过复域调制技术显著提升了功率回退效率，解决了传统功率放大器在低功率输出时效率低下的问题。该设计采用正交架构简化系统复杂度，并实现高数据率传输。

💡 主要创新点

• 首次在复域中利用开关/浮空电容结构实现功率放大器的高效回退操作，无需额外的CORDIC和相位调制器。
• 通过IQ单元共享技术提高了峰值效率，同时保持正交发射机的简单架构和高数据率特性。

🏷 关键词

📄 原文摘要

Modern wireless communication systems in portable devices require transmitters (TXs) with watt-level output power (Pout), high data-rate, and high efficiency, especially at power back-off (PBO) for enhanced average efficiency. CMOS digital TXs demonstrate high integration and high efficiency at low cost, which are attractive attributes in practical applications. Compared to polar TXs, quadrature TXs [1-6] show the advantages of a simpler architecture (without CORDIC and phase modulator) and higher data-rates. IQ cell sharing is used to increase the peak efficiency of quadrature TXs [2]. Besides, to achieve enhanced efficiency at PBO, various techniques are developed for digital TXs and digital power amplifiers (DPAs), such as Class-G Doherty [4], load modulation [5], hybrid Doherty with impedance boosting [6], 8 way-combined switched-capacitor power amplifier (SCPA) with a switched transformer [7], and time-interleaving Class-G Doherty

👥 作者与机构

Bingzheng Yang, Huizhen Jenny Qian, Xun Luo

University of Electronic Science and Technology of China, Chengdu, China