电子科技 ›› 2019, Vol. 32 ›› Issue (1): 76-79.doi: 10.16180/j.cnki.issn1007-7820.2019.01.0016

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一种可编程的高抗干扰AGC的设计

温杰1,吴治霖2,石玉1,刘兰3,胡越1,刘乐乐1   

  1. 1. 电子科技大学 微电子与固体电子学院,四川 成都 610054
    2. 中国电子科技集团公司第三十研究所, 四川 成都 610041
    3. 中国电子科技集团公司第二十九研究所,四川 成都 610036
  • 收稿日期:2017-12-20 出版日期:2019-01-15 发布日期:2018-12-29
  • 作者简介:温杰(1993-),男,硕士研究生。研究方向:信息材料与元器件。
  • 基金资助:
    国家自然科学基金(61471086)

Design of a Programmable High Anti-interference AGC

WEN Jie1,WU Zhilin2,SHI Yu1,LIU Lan3,HU Yue1,LIU Lele1   

  1. 1. School of Microelectronics and Solid-state Electronics,University of Electronic Science and Technology of China,Chengdu 610054, China
    2. The 30th Research Institute of China Electronic Technology Group Corporation, Chengdu 610041,China
    3. The 29th Research Institute of China Electronic Technology Group Corporation,Chengdu 610036,China
  • Received:2017-12-20 Online:2019-01-15 Published:2018-12-29
  • Supported by:
    National Natural Science Fund of China(61471086)

摘要:

在射频接收系统中,自动增益控制(AGC)电路能够有效改善接收机的动态范围。文中设计了一种可编程的高抗干扰AGC电路,采用“窄带滤波+对数放大+模数转换+单片机”的负反馈方式实现自动增益控制功能。经过实际测试,该电路在初始信噪比、信噪比分别恶化30 dB、60 dB和85 dB共4种情况下,增益动态范围达到32 dB,输出信号的功率误差<0.5 dB,表明该电路结构在恶劣的信噪比环境中仍然能够正常工作,具有良好的抗干扰能力。

关键词: 射频, 自动增益控制, 信噪比, 功率检测, 抗干扰, 编程控制

Abstract:

In the RF receiving system, Automatic Gain Control (AGC) circuit can effectively improve the dynamic range of the receiver. A programmable high anti-interference AGC circuit was designed to realize AGC by means of “narrow-band filter+logarithmic amplifier+analog-to-digital conversion+microcontrollers”. Through the practical test, in four conditions (including initial Signal Noise Ratio, SNR deteriorates 30 dB, 60 dB and 85 dB), the gain dynamic range reached 32 dB, and the power error of the output signal was less than 0.5 dB. It was shown that the structure of the circuit can still work normally in the bad SNR environment and had good anti-interference ability.

Key words: radio frequency, automatic gain control, signal noise ratio, power detection, anti-interference, programmable control

中图分类号: 

  • TN850.3