放大器饱和对AGC的影响分析  

Analysis of the Effect of Amplifier Saturation on the Performance of AGC

作　　者：周三文[1] 卢满宏[1] 黄建国[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《计算机测量与控制》2013年第7期1895-1898,共4页Computer Measurement &Control

摘　　要：针对放大器饱和对AGC环路参数设计的不利影响,通过建立AGC环路的对数模型,并结合放大器在饱和状态下输出信号被限幅的工作特点,分析并推导出了由于放大器饱和而导致建立时间延长的计算公式,用于无线接收系统,尤其是突发通信接收系统的工程参数设计,避免了采用非饱和状态下的设计参数而可能导致的数据不正确接收的问题;采用Simulink对AGC环路进行了仿真,仿真结果表明了理论推导和分析的正确性。A sudden significant rise of the input signal＇ s power level can cause amplifier saturation which will lead to an increased AGC settling time. The error recovery of data from the input signal can occur when using the parameters under amplifier non-- saturation. Based on the logarithmic model of AGC, the effect of amplifier saturation on its performance has been investigated in this work. The calculation for- mulae of AGC settling time in all cases are derived. The formulae are applied to design the engineering parameters of wireless receive system, especially burst communication system, to avoid error recovery of data when using the parameters under amplifier non--saturation. Simula- tion results demonstrate the correction of the theoretical analysis and derivation.

关 键 词：自动增益控制 建立时间 时间常数 可变增益放大器 饱和 

分 类 号：TN92[电子电信—通信与信息系统]