WLAN接收机自动增益控制研究与实现

摘要

针对WLAN接收机前端输入OFDM信号特性,提出了一种改进型自动增益控制(AGC)结构.该结构采用具有可选增益补偿系数的平均绝对能量误差自动增益控制方案,通过编程配置绝对能量误差参考门限,实现了快速、稳定的自动增益控制.同时,HJTC 0.18μm CMOS工艺流片使功能和性能满足设计指标要求.%In view of the OFDM signal of greatly dynamic range, high peak-average-power-ratio, a new adaptive Automatic Bain Control (AGC) scheme is proposed in this paper. This plan uses the mean absolute error automatic gain control structure with optional gain compensation coefficients, and through programming configures absolute power error reference threshold to realize the flexible multistep gain control of compensation mechanism. At the same time,considering the low power design demand, the circuit gives the sign of gain adjustment successful signal. In addition,the algorithm has good extension.