JSSC 2010第12期RF & Wireless0.13μm

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

本文介绍了一种宽信号带宽的笛卡尔环路发射器，用于外置PA线性化。

ACLR从30.2 dB提升至38.4 dB，EVM从5.9%降至1.6%

笛卡尔环路发射器外置PA线性化前馈技术自动校准FPGA

▸使用前馈技术避免RF路径时延引起的不稳定性

▸实现自动相位和幅度校准

▸通过FPGA实现控制器和结果存储

Abstract

This paper presents a wide signal bandwidth Carte- sian loop transmitter (CL T) IC for off-chip PA linearization. The CLT can linearize a 10 MHz bandwidth signal by using a feedfor- ward technique to avoid instability caused by a time delay of an RF path. The transmitter is fabricated in 0.13 m CMOS tech- nology. ACLR is improved from 30.2 dB to 38.4 dB and EVM is improved from 5.9% to 1.6% by using the feedback loop when 10 MHz OFDM signal is applied. The fabricated IC also realizes au- tomatic