3G系统中AGC的FPGA设计实现  

FPGA Design Implement of AGC in 3G

作　　者：王芙蓉[1] 王雪松[1] 陈印峰[1] 

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《现代电子技术》2007年第8期168-169,172,共3页Modern Electronics Technique

摘　　要：详细介绍了数字AGC的基本原理,3G接收机需要采用AGC电路处理输入的无线信号,从而给无线环路中的可变增益放大器或数控衰减器提供外部控制信号,使得无线链路输出基本恒定且与输入信号电平无关的信号给基带部分处理,同时在很宽的范围内保持线性。RF输入电压经IF放大后,检波器检测出该电压的包络。该包络电压经AGC处理后,产生增益可变器件的控制电压,从而减小IF的输入和增益。The paper introduces the basic theory of digital AGC. TD SCDMA receiver needs AGC circuit to adjust the input wireless signal, which can provide control signal to variable gain amplifier or digital attenuator. So the wireless link can output a signal that is invariableness and is independent of input level to baseband,and keep linear in a wide range. First the IF amplifier enlarges the input RF signal, then the voltage outline is detected by the radiodetector. Processed with AGC , this outline generate control level for variable gain apparatus,so the input of IF and gain is reduced.

关 键 词：TD_SCDMA AGC自动增益控制 3G RF 

分 类 号：TN929.5[电子电信—通信与信息系统]