Digital phase locked loop having coarse and fine stepsize variab

Details Digital phase locked loop having coarse and fine stepsize variab Digital phase locked loop having coarse and fine stepsize variab

1995-09-29

1997-02-18

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

331 25, H03D 324

Patent

active

056047754

ABSTRACT:
In a digital phase locked loop, a coarse stepsize variable delay line and a fine stepsize variable delay line are connected in series for receiving a reference clock pulse and imparting thereto variable delays in accordance with higher significant bits and lower significant bits. The delayed clock pulse is delivered to the input of a clock tree through which the clock pulse propagates and are supplied to various parts of an integrated circuit chip. A phase detector provides a phase comparison between the reference clock pulse and a delayed clock pulse appearing at one of the outputs of the clock tree. A delay controller counts the reference clock pulse to produce a count value, and increments or decrements the count value in accordance with the output of the phase detector. The up-down count value is supplied as the higher and lower significant bits to the coarse and fine stepsize variable delay lines at such longer intervals than the intervals at which the reference clock pulse occurs, so that the delayed clock pulse is allowed a sufficient time to propagate through the clock tree.

REFERENCES:
patent: 4912433 (1990-03-01), Motegi et al.
patent: 5079519 (1992-01-01), Ashby et al.
patent: 5109394 (1992-04-01), Hjerpe et al.
patent: 5341110 (1994-08-01), Nardi
patent: 5347234 (1994-09-01), Gersbach et al.

Affiliated with

Also associated with

Rating

Digital phase locked loop having coarse and fine stepsize variab does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital phase locked loop having coarse and fine stepsize variab, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital phase locked loop having coarse and fine stepsize variab will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1607640