Method and circuit for phase lock loop initialization

Details Method and circuit for phase lock loop initialization Method and circuit for phase lock loop initialization

1983-09-29

1985-12-24

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, 328134, 328155, 307527, H03L 700

Patent

active

045609500

ABSTRACT:
A method and circuit for quickly adjusting the frequency of a phase lock loop controlled oscillator to match a reference frequency signal by starting the reference frequency signal at essentially zero initial phase coincident with a zero crossing of the oscillator output. The reference frequency signal is provided by dividing a higher source frequency signal a predetermined amount. Upon receipt of an initialization signal the divider and the phase lock loop are inhibited. Upon the occurrance of a zero crossing the divider and loop are enabled so that the reference signal starts at zero phase within a predetermined period following the zero crossing, and the loop thereafter adjusts the oscillator frequency.

REFERENCES:
patent: 4309662 (1982-01-01), Baudoux

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