PU lock acquisition with scan restart upon false lock

Details PU lock acquisition with scan restart upon false lock PU lock acquisition with scan restart upon false lock

1985-06-13

1986-10-14

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 14, 331 17, 331DIG2, H03L 706

Patent

active

046175270

ABSTRACT:
A phase locking circuit for effecting pull-in of a phase locked loop to a desired frequency component even in the presence of spurious signals includes a phase locked loop, a scanning circuit and a control circuit. The scanning circuit generates a scanning current to the phase locked loop which activates a voltage controlled oscillator (VCO) therein, the VCO output being phase locked to an input signal by operation of the phase locked loop. The control circuit produces a periodic scanning restart signal causing the scanning circuit to periodically generate a second scanning current independent of the phase lock status of the phase locked loop until a phase lock to the desired frequency component is realized. The second scanning current functions to unlock a VCO output locked to a spurious signal.

REFERENCES:
patent: 4000476 (1976-12-01), Walker et al.
patent: 4077016 (1978-02-01), Sanders et al.
patent: 4423390 (1983-12-01), Waters
patent: 4443769 (1984-04-01), Aschwanden et al.

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