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 d B、60 d B和85 d B共4种情况下,增益动态范围达到32 d B,输出信号的功率误差<0. 5 d B,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。
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 deteriorates30dB,60dB and85dB),the gain dynamic range reached32dB,and the power error of the output signal was less than0.5dB.It was shown that the structure of the circuit can still work normally in the bad SNR environment and had good anti-interference ability.
作者
温杰
吴治霖
石玉
刘兰
胡越
刘乐乐
WEN Jie;WU Zhilin;SHI Yu;LIU Lan;HU Yue;LIU Lele(School of Microelectronics and Solid-state Electronics,University of Electronic Science and Technology ofChina,Chengdu 610054, China;The 30 th Research Institute of China Electronic Technology Group Corporation,Chengdu 610041,China;The 29 th Research Institute of China Electronic Technology GroupCorporation,Chengdu 610036,China)
出处
《电子科技》
2019年第1期76-79,共4页
Electronic Science and Technology
基金
国家自然科学基金(61471086)~~
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
radio frequency
automatic gain control
signal noise ratio
power detection
anti-interference
programmable control
