A 24.7dBm All-Digital RF Transmitter for Multimode Broadband Applications in 40nm CMOS

📋 论文概要

本文提出了一种采用40nm CMOS工艺的全数字射频发射器，适用于多模宽带应用。针对正交数字功率放大器（DPA）中I/Q路径交互导致的线性度下降问题，提出了一种创新的二维数字预失真技术来补偿AM-AM/AM-PM失真。

💡 主要创新点

• 提出全数字正交DPA架构，通过数字基带信号直接控制RF电流输出，避免传统模拟混频器的非线性。
• 创新性采用二维数字预失真技术，同时考虑I/Q路径的相互影响，有效补偿I/Q交互导致的线性度恶化。
• 实现了24.7dBm的高输出功率，支持多模宽带应用，适用于软件定义无线电等场景。

🏷 关键词

📄 原文摘要

Berkeley, CA 1 to the load, and AM-AM/AM-PM distortion, similar to conventional power amplifiers. Particularly in our quadrature DPA architecture, the RF current is the combined output of I-PA and Q-PA, and the effect of I/Q interaction is no longer negligible. In other words, the transfer function of Q-PA is not only determined by quadrature control bits Q-BB[12:0] but also a function of I-PA source impedance (and thereby in-phase baseband amplitude control bits I-BB[11:0]), and vice versa. To restore DPA linearity under the presence of I/Q interaction, an innovative two-dimensional digital predistortion (2D-DPD) scheme is developed. 3 Recently, digitizing RF circuits has attracted extensive attention by exploiting

👥 作者与机构

Chao Lu1, Hua Wang1, CH Peng2, Ankush Goel3, SangWon Son1,

Paul Liang2, Ali Niknejad4, HC Hwang2, George Chien1 MediaTek, San Jose, CA, 2MediaTek, Hsinchu, Taiwan, University of Southern California, Los Angeles, CA, 4 University of California