System for preventing transient induced errors in phase locked l

Details System for preventing transient induced errors in phase locked l System for preventing transient induced errors in phase locked l

1981-09-28

1983-06-21

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 1A, 331 14, 331DIG2, 375120, H03L 708, H04L 2712

Patent

active

043896227

ABSTRACT:
A system for minimizing synchronization errors in a phase-locked loop having a sequential phase detector for determining the phase difference between the output of the VCO of the phase-locked loop and a periodic control signal. Control circuitry is provided so that the control signal is enabled as an input to said sequential phase detector for a relatively short time window which comprises a small fraction of the control signal cycle period beginning just before a control signal is anticipated and the signal is disabled for the remainder of said control signal cycle period. Provision is made for the phase detector to process only the first control signal in any given enable time window. Additional circuitry is provided to disable the control circuitry when the phase locked loop is detected to be out of lock.

REFERENCES:
patent: 3906376 (1975-09-01), Bass
patent: 3908115 (1975-09-01), Waggener
patent: 4068181 (1978-01-01), Clark et al.
patent: 4112383 (1978-09-01), Burgert
patent: 4122405 (1978-10-01), Tietz et al.

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