基于锁相环的解调技术研究  

Demodulation Technology Based on Phase-locked Loop

作　　者：罗莹[1,2] 张志伟[3] 杨宁 

机构地区：[1]中北大学信息与通信工程学院,山西太原030051 [2]浙江省通信产业服务有限公司咨询设计院,浙江杭州310000 [3]中北大学电子测试技术重点实验室,山西太原030051 [4]内蒙古自治区新闻出版广电局乌审854发射台,内蒙古鄂尔多斯017300

出　　处：《计量学报》2015年第4期432-435,共4页Acta Metrologica Sinica

摘　　要：介绍了调相信号的锁相解调技术基本原理以及利用集成锁相环NE564实现对信号的锁相解调。为了解调出不失真的波形，利用集成锁相环NE564和LM725CN芯片设计PM调制解调系统，可以直接实现信号的调制解调功能，利用相位能稳定跟踪的特点避免了频率失锁的缺陷，提高了测量精度。该系统具有操作简单、稳定性强的优点，并在激光外差干涉信号的解调中具有较强的实用性。The fundamentals of the PLL phase-modulated signal demodulation technique is described, and the integrated PLL NE564 is used to achieve lock demodulated for the signal. In order to demodulate the undistorted waveforms, the PM demodulation system using the integrated PLL NE564 and LM725CN chip is designed. The system can achieve the function of signal modulation demodulation directly and advantage of the characteristics of phase to the stability of the track to avoid the defect of the frequency lock loss, and improve the measurement accuracy. The system is simple, strong stability advantages, and has a strong practicability for heterodyne laser interferometer demodulation signal.

关 键 词：计量学 锁相环 NE564 调制解调 激光外差干涉 

分 类 号：TB973[一般工业技术—计量学]