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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) automatically adjusts the gain based on the size of the signal input. Dynamic range and time constant are two of the key parameters. Starting from the performance analysis of analog AGC, the method of calculating the constant time constant structure and the time constant of digital AGC is given. The transient operating characteristics of the digital AGC with time constant of large dynamic signal input are verified. Combining with the method of constant time constant Given the structure of large dynamic AGC program. The related research conclusions have been applied to a single-channel monopulse digital tracking receiver in the constant time constant frequency AGC FPGA implementation.