高精度幅相检测系统的设计

Design of high-precision magnitude and phase measuring system

为了提高幅相检测精度、简化电路、扩展频率范围,设计了一种基于AD8302高精度幅度相位检测系统。通过分析AD8302的特点以及工作原理,提出了几种提高相位检测精度的方法,并设计采用AD8302、DDS和单片机组成高精度幅相检测系统,成功地解决了AD8302相位检测过程中存在的二值性、非线性、移相以及校准问题,实现两路模拟输入信号的相位差和幅度差的精确测量。测试结果表明基于AD8302的幅相检测系统具有精度高、抗干扰能力强等优点。

In order to raise the accuracy of the magnitude and phase measuring,predigest the circuit,enlarge the range of the frequence,a kind of the magnitude and phase measuring system with high precision based on AD8302 is designed.This paper analysed the AD8302 Character and the working principle,and presented several methods to improved high-precision phase measuring.Then compose the magnitude and phase measuring system with high precision based on AD8302 DDS and MCU,It is successful to resolve problem of double value,nolinear,phase shift and calibrate in AD8302 phase measuring system,to realize the measurement of the magnitude and phase of the two simulated input signal.The results shows that magnitude and phase measuring system based on AD8302 has the advantages of precision and strong anti-jamming.