Analog Phase-Locked-Loop (simple model)
Analog phase locked loops are very difficult to model, but are 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. Manually adjusted signal, 3. Arbitrary signal
Phase Locked Loop: i) Phase Detector - Multiplier followed by very sharp cutoff low pass filter, ii) Loop Filter - one zero/one pole, iii) 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Unpublished Reports on Motor Control Phase Locked Loops by Morris Frayman
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