基于AD8302的高精度幅相检测系统的设计

摘要

In order to raise the accuracy of the magnitude and phase measuring, predigest the circuit, enlarge the range of the frequence, the paper introduces the chip of AD8302, which is used to measure the RF/IF gain/ loss and phase.Then compose the magnitude and phase measuring system with high precision based on AD8302 and MCU, to realize the measurement of the magnitude and phase of the two simulated input signals, and compose the judgement circuit of phase polarity with Schmitt trigger and D trigger, enlarge the range of the frequence test to 0- 360°.The system can measure the magnitude and phase accurately of the input signal.The results shows that magnitude and phase measuring system based on AD8302 has the advantages of precision and strong anti-jamming.%为了提高幅相测量精度、简化电路,扩展频率范围,介绍了一种用于RF/IF幅度和相位测量的AD8302芯片;并利用此芯片和单片机组成高精度幅相检测系统,主要是以实现两路模拟输入信号的相位差和幅度比测量为目的;并利用分频器、施密特触发器和D触发器组成相位极性判断电路,扩展相位测量范围为0～360°;该系统能精确测量两输入信号的幅度比和相位差,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.