Electronic Science and Technology ›› 2019, Vol. 32 ›› Issue (1): 76-79.doi: 10.16180/j.cnki.issn1007-7820.2019.01.0016

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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)


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

CLC Number: 

  • TN850.3