Phase locked loop having rapid tuning

Details Phase locked loop having rapid tuning Phase locked loop having rapid tuning

1981-03-02

1983-04-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 17, 331 25, H03L 718

Patent

active

043792707

ABSTRACT:
A system is disclosed for very rapid tuning of a phase-locked loop. A fixed oscillator feeds a reference frequency to a phase comparator via a fixed divider, while a variable frequency oscillator (VCO) feeds its output frequency to the comparator via an adjustable divider. In response to a phase error, the comparator produces a control signal which is integrated in an integrator to adjust the VCO frequency. The value of the control signal is such that the VCO frequency is changed in a sense and by an amount which produces a temporary phase error in the opposite direction to the detected phase error. At such time, before the next phase comparison, as the temporary phase error has compensated for the detected phase error, a switch makes a set change in the integrator output so as to eliminate the temporary phase error and thereby to tend to equalise the control and reference frequencies at the end of that cycle.

REFERENCES:
patent: 3609577 (1971-09-01), Bos
patent: 4115745 (1978-09-01), Egan
patent: 4219783 (1980-08-01), Carter et al.
patent: 4330758 (1982-05-01), Swisher et al.

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