Demodulation Technology Based on Phase-locked Loop
LUO Ying1,2,ZHANG Zhi-wei3,YANG Ning4
1.School of Information and Communication Engineering, North University of China, Taiyuan, Shanxi 030051, China;
2.Consulting Services Ltd. of Zhejiang Institute of Communications Industry, Hangzhou, Zhejiang 310000, China;
3.National Key Laboratory for Electronic Meas Tech, North University of China, Taiyuan, Shanxi 030051, China;
4.Inner Mongolia Radio and Television News Publishing 854 launchers, Ordos City, Inner Mongolia 017300,China
Abstract：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.
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2015, Vol. 36 
