Method and apparatus for detecting and correcting loss of freque

Details Method and apparatus for detecting and correcting loss of freque Method and apparatus for detecting and correcting loss of freque

1992-04-13

1993-06-15

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331DIG2, H03L 700

Patent

active

052202950

ABSTRACT:
A Loss of Lock Detector and Re-lock Control function using digital techniques to detect a programmable difference in frequencies over a programmable range. Once Loss of Lock is detected, the Re-lock sequence is initiated and PLLIS, PLLMS & PLLGS are stepped through a programmable sequence. The invention detects the frequency difference by counting down two counters and evaluating the value left in one when the other reaches terminal count using a programmable tolerance of frequency differences before Loss of Lock is declared. The complexity and cost of implementation of the invention is reduced by multiple use of a single down counter. Other features of the invention are disclosed.

REFERENCES:
patent: 3956710 (1976-05-01), Seitz et al.
patent: 4646031 (1987-02-01), Fast et al.

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