A 10MHz Signal Bandwidth Cartesian-Loop Transmitter Capable of Off-Chip PA Linearization

📋 论文概要

该论文提出了一种基于笛卡尔环路的发射机，能够实现10MHz信号带宽，并支持片外功率放大器线性化。通过该技术，可以在不牺牲效率的情况下改善线性度，满足高PAPR信号的EVM和ACLR要求。

💡 主要创新点

• 提出了一种适用于高PAPR信号的笛卡尔环路发射机架构，能够有效线性化片外PA。
• 实现了10MHz信号带宽的线性化发射，同时保持较高的功率效率。

🏷 关键词

📄 原文摘要

Recently, signals with high peak-to-average power ratio (PAPR) are being used for metropolitan area networks (MANs) and cellular systems, and therefore highly linear transmitters (Txs) are required. The linearity performance can be improved by operating a power amplifier (PA) with large back-off; however, it sacrifices the efficiency. Therefore, a Tx linearizer is required to satisfy the errorvector magnitude (EVM) and adjacent-channel-leakage ratio (ACLR) requirements with smaller back-off. Since highly efficient PAs fabricated in GaAs or SiGe processes are preferred for these applications, a linearizer for an off-chip PA is desired. The Cartesian loop transmitter (CLT) is suitable for linearization of the off-chip PA because feedback (FB) can suppress any non-linearity even if the distortion characteristic is unknown [1-5]. However, extending the bandwidth of the CLT is a challenge because a delay in the RF path degrades the stability. The effect

👥 作者与机构

Hiroaki Ishihara, Masahiro Hosoya, Shoji Otaka, Osamu Watanabe

Toshiba, Kawasaki, Japan