使用AD603和AD8318实现大动态范围IF接收机

Design a Big Dynamic Range IF Receiver with AD603 and AD8318

通过对雷达接收设备中中频接收设备电路的基本原理的学习和研究,着重介绍了低噪声可变增益放大器AD603以及高精确度和温度稳定性的对数放大检波器AD8318的使用。最后以AD603,AD8318为核心放大器、检波器,详细阐述了中频接收机放大电路和检波电路以及滤波器电路的设计与实现,实现了超过100dB动态范围的IF接收机。最后通过测试提出了一些相关注意事项。

According to the principle of circuit which is in IF equipment of radar receiver,the paper introduces how to use low noise variable gain amplifier AD603, high accuracy and stability over temperature logarithmic detector AD8318. This paper regards AD603 and AD8318 as main amplifier and detector,and particular expounds the circuit of amplifier, detector and filter, finally,it realizes over 100dB dynamic range IF receiver. In the end,it brings forward some questions about receiver through the testing.