摘要
自动增益控制(AGC)能够根据信号输入大小自动调整增益,动态范围和时间常数是其中的两个关键指标。从模拟AGC的性能分析入手,给出了数字AGC恒定时间常数结构和时间常数的计算方法,仿真验证了大动态信号输入下约束时间常数数字AGC的瞬态工作特性,并结合恒定时间常数实现方法给出大动态AGC的结构方案。相关研究结论已应用于某单通道单脉冲数字跟踪接收机中恒定时间常数中频AGC的FPGA实现。
Automatic Gain Control （AGC） is widely used in automatically adjusting the amplifier gain based on the input signal power, and both the input dynamic range and settling time are the key designing criterions The performance of analog AGC is analyzed first, and the settling time of digital AGC is presented. The instantaneous working characteristic of digital AGC is verified by computer simulation, and the implementation of system block diagram is also given. The related conclusions presented here are applied to the FPGA implementation of digital AGC for a single channel mono-pulse self-tracking receiver
出处
《通信技术》
2011年第12期144-146,共3页
Communications Technology
关键词
数字AGC
大动态
时间常数
digital automatic gain control
wide dynamic range
settling time
