| 3G系统中AGC的FPGA设计实现 |
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| 引用本文： | 王芙蓉,王雪松,陈印峰.3G系统中AGC的FPGA设计实现[J].现代电子技术,2007,30(8):168-169,172. |
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| 作者姓名： | 王芙蓉 王雪松 陈印峰 |
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| 作者单位： | 华中科技大学,湖北,武汉,430074 |
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| 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。
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| 关 键 词： | AGC自动增益控制 |
| 文章编号： | 1004-373X（2007）08-168-02 |
| 收稿时间： | 2006-11-16 |
| 修稿时间： | 2006-11-16 |
FPGA Design Implement of AGC in 3G |
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| WANG Furong,WANG Xuesong,CHEN Yinfeng.FPGA Design Implement of AGC in 3G[J].Modern Electronic Technique,2007,30(8):168-169,172. |
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| Authors: | WANG Furong WANG Xuesong CHEN Yinfeng |
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| Institution: | Huazhong University of Science and Technology,Wuhan,430074,China |
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| Abstract: | 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. |
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| Keywords: | TD_SCDMA 3G RF |
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