双环AGC电路的起控点参数分析与设计  

Analysis and design of starting control point parameters of double⁃loop AGC circuit

作　　者：陈新 CHEN Xin(The 10th research institute of China Electronics Technology group Corporation,Chengdu 610036,China)

机构地区：[1]中国电子科技集团公司第十研究所,四川成都610036

出　　处：《现代电子技术》2023年第10期17-20,共4页Modern Electronics Technique

摘　　要：文中提出一种新的双环AGC控制电路设计思路,并对设计过程进行详细阐述。从单环到双环AGC设计,通过搭建两级自动增益控制电路,叠加控制量之和,从而增大控制范围,实现大动态范围信号处理能力。基于双环AGC电路的实例应用,分析双环AGC电路起控参数的设计思路和影响。另外,提出参数设计既要考虑因为射频AGC起控太早而恶化接收通道的噪声系数,又要避免射频AGC起控太晚造成接收通道饱和或是互调指标恶化的遵循原则。A design idea of new double⁃loop AGC control circuit is proposed,and its design process is expounded in detail.A two⁃stage automatic gain control circuit is built to superimpose the sum of the control quantities,so as to increase the control range and improve signal processing capability in large dynamic range.According to the practical application of a dual⁃loop AGC circuit,the design idea and influence of the starting control parameters of the dual loop AGC circuit are analyzed.In the parameter design,the principles,that the noise figure deterioration of the receiving channel due to the too early start of the RF AGC should be considered,and that the saturation or deterioration of the intermodulation index of the receiving channel due to the too late start of the RF AGC should also be avoided,are proposed in this paper.

关 键 词：双环AGC电路 起控参数 电路设计 信号处理 射频AGC电路 中频AGC电路 参数分析 

分 类 号：TN850.3-34[电子电信—信息与通信工程] TP311[自动化与计算机技术—计算机软件与理论]