AF_PLL

Published:2009/7/6 1:04:00 Author:May | From:SeekIC

Addition of components to conventional two-transistor MVBR gives simple phase-locked loop. Tr1 and diode form logic gate that conducts during alternate half-cycles of input and VCO waveforms respectively. Output of this phase detector, when filtered, is most negative when waveforms are in phase, and most positive when they are out of phase. Once phase lock has been established, it is maintained by VCO over range of 100 to 3000 Hz.-J. B. Cole, Simple Phase-Locked Loop, Wireless World, June 1977, p 56.



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