Method and apparatus for adaptive control of PLL loop bandwidth

Details Method and apparatus for adaptive control of PLL loop bandwidth Method and apparatus for adaptive control of PLL loop bandwidth

2006-06-13

2006-06-13

Bayard, Emmanuel (Department: 2634)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S376000

Reexamination Certificate

active

07062004

ABSTRACT:
A scheme for reducing jitter in high-speed digital communication by adaptively controlling the loop bandwidth of a receiver PLL to reduce the relative jitter between the recovered data and clock. The scheme uses phase pointer activity to represent the relative jitter. The phase pointer activity is measured and used to control the receiver PLL loop bandwidth. The receiver PLL loop bandwidth is repeatedly incremented or decremented by a step size based on the comparison between a newly measured activity value and the old activity value, until the phase pointer activity reaches a minimum. Because the PLL performance requirement of the transmitter can be relaxed, compatibility with legacy transmitters and multi-vendor transmitters is enhanced. Because tight control of fabrication process parameters of PLLs may be relaxed, the fabrication yield may also be improved.

REFERENCES:
patent: 4691176 (1987-09-01), Hsiung et al.
patent: 4789996 (1988-12-01), Butcher
patent: 5056118 (1991-10-01), Sun
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5268655 (1993-12-01), Dong
patent: 5604773 (1997-02-01), Urala
patent: 5757652 (1998-05-01), Blazo et al.
patent: 5828255 (1998-10-01), Kelkar et al.
patent: 6044122 (2000-03-01), Ellersick et al.
patent: 6151076 (2000-11-01), Hoffman et al.
patent: 6307411 (2001-10-01), Kerner
patent: 6614275 (2003-09-01), Amick et al.
patent: 6696886 (2004-02-01), Ke et al.
patent: 2002/0064247 (2002-05-01), Ahn et al.
patent: 2004/0001567 (2004-01-01), Wei

Affiliated with

Also associated with

Rating

Method and apparatus for adaptive control of PLL loop bandwidth does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for adaptive control of PLL loop bandwidth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for adaptive control of PLL loop bandwidth will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3675279