本文给出了一种用于信号强度快速变化情况下的自动增益控制回路。在扼要回顾一般的自动增益控制回路的基础上,从回路调整时间为有限这一条件出发,寻求了信号强度快速变化时回路的参数;并用z变换方法进一步分析了回路性能,确定了稳定条件、跟踪条件、跟踪范围。最后简述了电路设计的一些考虑。 This paper presents an automatic gain control loop for rapid signal strength changes. Based on a brief review of the general automatic gain control loop, the parameters of the loop with fast signal strength change are sought from the condition that the loop adjustment time is limited, and the loop performance is further analyzed by z-transform method to determine the steady conditions, Tracking conditions, tracking range. Finally, some considerations of circuit design are briefly described.