A Single-Chip WCDMA Envelope Reconstruction LDMOS PA with 130MHz Switched-Mode Power Supply

📋 论文概要

本文提出了一种单芯片WCDMA包络重建LDMOS功率放大器，采用极坐标架构，将射频相位信号通过饱和PA放大，并由高效率宽带低失真开关模式电源（SMPS）调制包络，以满足WCDMA噪声和带宽要求。通过集成2线圈SMPS和数字预失真或辅助线路方案，解决了传统线性PA效率低的问题。

💡 主要创新点

• 首次实现了单芯片集成的WCDMA包络重建PA与130MHz开关模式电源，减少了分立元件。
• 采用2线圈SMPS配合数字预失真，或辅助线路方案，有效满足WCDMA的噪声和带宽要求。
• 利用LDMOS工艺实现高效率饱和PA与宽带SMPS的片上协同设计。

🏷 关键词

📄 原文摘要

signals and generally use low-efficiency linear power amplifiers. Envelope reconstruction (ER) polar architecture allows linear amplification with high efficiency, since the RF phase signal is amplified by a saturated PA, and the envelope is modulated by an efficient wide-band low-distortion switched-mode power supply (SMPS), as shown in Fig. 31.4.1. ER benefits have been proven using various supply modulators and separate PAs. The PA in [1] complied with WCDMA noise and BW requirements using a 2 coil SMPS with digital pre-distortion. Alternatively, the SMPS is assisted by a supplementary linear regulator for EDGE [2, 3] and WLAN [4] at the cost of extra power consumption. This paper presents a single-chip ER circuit for cellular applications. It includes a high-band PA and its switched-mode supply

👥 作者与机构

Vincent Pinon, Frédéric Hasbani, Alexandre Giry, Denis Pache, Christophe Garnier

STMicroelectronics, Crolles, France Spectrally efficient modulations such as WCDMA require non-constant envelope