Repeatable timing error correction system for use in a servo...

Details Repeatable timing error correction system for use in a servo... Repeatable timing error correction system for use in a servo...

2007-04-03

2007-04-03

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S053000, C360S031000, C360S075000

Reexamination Certificate

active

11010554

ABSTRACT:
A servo writing system for writing servo sectors onto a disk includes a direct digital synthesizer (DDS) that forms a phase and frequency adjustable continuous wave signal based upon a reference digital clock signal. A PLL coupled to the DDS measures repeatable timing errors (RTEs) associated with the continuous wave signal and generates an output clock signal that is used to clock the writing of servo sectors onto the disk. A digital control system is coupled to the DDS and the PLL, which calculates repeatable error compensation adjustment values based on the RTEs measured using the PLL. The compensation adjustment values may be applied to the DDS such that the DDS compensates for the RTEs and such that the output clock signal used to clock the writing of the servo sectors onto the disk includes minimal RTEs.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 6388833 (2002-05-01), Golowka et al.
patent: 6515813 (2003-02-01), Kitazaki et al.
patent: 6542044 (2003-04-01), Berquist et al.
patent: 6657810 (2003-12-01), Kupferman
patent: 6664827 (2003-12-01), O'Leary et al.
patent: 6788350 (2004-09-01), Zimmermann
patent: 6898035 (2005-05-01), Chainer et al.
patent: 2003/0123180 (2003-07-01), Settje et al.
patent: 2004/0070432 (2004-04-01), Chauhan
patent: 2004/0156137 (2004-08-01), Settje et al.

Affiliated with

Also associated with

Rating

Repeatable timing error correction system for use in a servo... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Repeatable timing error correction system for use in a servo..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Repeatable timing error correction system for use in a servo... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3732915