Abstract: According to the large dynamic range of signals, this paper proposes a method of design of digital Auto Gain Control(AGC) based on the chip AD8369 and two-slope filtering technique, which is applied in extracting the amplitude of the signal circuit, as well as the algorithms of digital AGC. The validity of algorithms is verified by the simulation in Matlab, and the result of the test, its analysis of errors and improved method is also given.

Key words: Auto Gain Control(AGC), two-slope filtering, AD8369

摘要：

针对科研实践中需要采集大动态范围模拟信号的问题，构建基于可变增益放大器8369的数字AGC系统。采用基于双斜率滤波技术的设计，给出AGC控制算法的实现流程，利用Matlab仿真引入算例证明算法的可行性，并讨论算法中关键参数取值对控制精度的影响。实际系统达到50 dB动态范围的设计目标。

关键词: 自动增益控制, 双斜率滤波, 可变增益放大器8369

CLC Number: 

• TP316