This paper introduces the key specifications and its architecture of AD8369, and designs a full digital automatic gain control(DAGC) system for digital intermediate frequency receiver, and provides its control circuit and algorithm.

• 介绍了数字可变增益放大器(DVGA)AD8369的电路结构及其关键技术指标,并用该芯片为数字中频接收机设计了全数字自动增益控制(DAGC)系统,给出了其控制回路及其实现算法。