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Digital Phase-Locked Loop System  File Size 9.84K | Date Added August, 21, 2000 You can you use and modify any of these worksheets with the Vissim 7 trial

Digital Phase-Locked-Loop (simple model) Phase locked loops are very difficult to design, but easy to model with VisSim. Parameter values are very critical and it is difficult to casually determine them. The model shown here contains INPUTS: 1. Constant Frequency Source, 2. Arbitrary signal Phase Locked Loop i) Phase Detector - CD4035 followed by very sharp cutoff low pass filter, ii) Loop Filter - one zero/one pole, iii) Digital voltage-controlled oscillator (VCO) Plots of relevent variables You are encouraged to modify model, vary parameters, explore other variations. References for this model include Frequency Synthesizers- 3rd Ed - Vadim Manassewitsch- 1987 Phase-Locked Loops - Alain Blanchard- 1976 Phase Lock Techniques - 2nd Ed - Floyd M. Gardner - 1979 Phase Locked Loop Circuit Design - Dan H. Wolaver - 1991 Unpublished Reports on Motor Control Phase Locked Loops

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