基于二阶环路滤波器的改进数字AGC设计

Improved Digital AGC Design Based on Second-order Loop Filter

针对传统自动增益控制(AGC)系统响应时间和控制精度相互矛盾、过调量无法消除的问题,设计一种基于二阶环路滤波器的数字AGC系统。推导AGC环路方程,求解时间常数和控制精度的解析表达式。仿真结果证明,采用二阶环路滤波器可使AGC系统性能稳定,同时满足响应时间短、控制精度高的要求。该系统可根据实际工程需求进行灵活调节。

To solve the conflict between the response time and control precision for the traditional Automatic Gain Control(AGC) system,a digital AGC system is proposed based on the second-order loop filter.The AGC loop equations are derived,including the time constant and control accuracy expressions.Simulation results show the good performance and the proposed digital AGC system can meet the requirements of both short response time and high control precision.This AGC system can be adjusted for further implementation.