Jitter measurement using a statistically locked loop

Details Jitter measurement using a statistically locked loop Jitter measurement using a statistically locked loop

1994-03-14

1996-01-02

Chin, Stephen

Pulse or digital communications

Testing

Phase error or phase jitter

375371, 375376, 375374, 375359, 375355, H04L 700, H04B 346

Patent

active

054815630

ABSTRACT:
A jitter measurement system for a serial digital data link includes a clock recovery element effective to separate a clock signal from the digital data bits being transmitted. The clock signal is applied first to a programmable delay element whose output is applied to as a first input to a decision circuit. The second input to the decision is the serial data stream. The relation of the data to the clock is initially set so that the clock is sampling the data at approximately the transition point of the data. Depending on the exact location of the data relative to the clock signal, the result of the sampling process will yield one of two results. First, if the data transition occurs before the clock transition, no error results. However, if the clock transition occurs before the data transition, an error results. An error ratio detector circuit determines an error ratio which is compared to a predetermined reference. If the reference is exceeded by error ratio, the delay of the programmable delay circuit is adjusted in a closed loop fashion to make the error ratio correspond to the predetermined allowable error rate.

REFERENCES:
patent: 3771059 (1973-11-01), Butler et al.
patent: 4757452 (1988-07-01), Scott et al.
patent: 4942593 (1990-07-01), Whiteside et al.
patent: 4974234 (1990-11-01), Brandt
patent: 4985900 (1991-01-01), Rhind et al.
patent: 5103466 (1992-04-01), Bazes
patent: 5121342 (1992-06-01), Szymborski et al.

Affiliated with

Also associated with

Rating

Jitter measurement using a statistically locked loop does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Jitter measurement using a statistically locked loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Jitter measurement using a statistically locked loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-241807