Programmable digital out-of-lock detector

Details Programmable digital out-of-lock detector Programmable digital out-of-lock detector

1991-11-26

1993-01-19

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307527, 328110, 328133, 331DIG2, H03K 906, H03K 526

Patent

active

051809338

ABSTRACT:
A out-of-lock detector is described which provides a first series of pulses that are compared to a data stream of pulses. Second and third series of pulses are also created by the present invention. These lead and lag pulses are provided to represent particular logical relationships between the data stream and a clock signal. The sequential relationship between the lead pulses and the lag pulses are compared to determine whether or not the clock pulses and the data pulses are in a phase lock condition or, alternatively, are in an out-of-lock condition. A sequence comparator provides a logically low output pulse if an out-of-lock event is detected. A counter compares the number of out-of-lock events which occur in a predetermined period of time to a preset and programmable value. If an out-of-lock condition is detected, some external means for providing corrective action can then be implemented to bring the phase locked loop into a condition where it can again achieve a locked state. Both the value of the counter modulo N and the value of the predetermined period of time during which out-of-lock conditions are counted are programmable.

REFERENCES:
patent: 4354124 (1982-10-01), Shima et al.
patent: 4675558 (1987-06-01), Serrone et al.
patent: 4904948 (1990-02-01), Asami

Affiliated with

Also associated with

Rating

Programmable digital out-of-lock detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable digital out-of-lock detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable digital out-of-lock detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-103689