A 1.8GHz Linear CMOS Power Amplifier with Supply-Path Switching Scheme for WCDMA/LTE Applications

📋 论文概要

该论文提出了一种用于WCDMA/LTE应用的1.8GHz线性CMOS功率放大器，通过采用供应路径切换方案来提高平均功率效率，解决了线性CMOS PA在移动终端中效率低下的问题。

💡 主要创新点

• 提出供应路径切换方案，在低输出功率时切换到低电压路径以提升回退效率，避免传统Doherty或包络跟踪技术的复杂性问题。
• 实现了1.8GHz频段下的线性CMOS PA，适用于WCDMA/LTE调制信号，无需外部线性化电路。

🏷 关键词

📄 原文摘要

Low-cost CMOS PAs for mobile terminals have been a focus of attention in recent years. Self-contained, linear CMOS PAs are particularly attractive for smooth replacement of conventional compound semiconductor PA products. The main challenge concerning the linear CMOS PAs is to improve their power efficiency. Doherty PAs improve the average power efficiency by means of backoff efficiency boosting; however, their applicable carrier frequency range is narrow owing to the high-order output network. Supply modulation is another technique to improve the PA back-off efficiency. Although hybrid modulators have been studied for CMOS polar transmitters [1,2], none of them have satisfied full specs of modulation bandwidth and the output power for 4G cellular applications. The area overhead is also unacceptable for application to a self-contained linear PA. A class-G supply modulator relaxes the limitations by receiving external, discrete levels of supply voltages [3]. However, it still requires a

👥 作者与机构

Kohei Onizuka, Shigehito Saigusa, Shoji Otaka

Toshiba, Kawasaki, Japan