Position mode track seek servo for high capacity disk drive system
US4972350A · kind A · utility
26Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | May 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08517
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
During the arrival phase of long seeks, e.g. the last six tracks of a seek, and during the entirety of relatively short seeks, e.g. seeks of less than 256 tracks, position mode servo control is employed by locking an actual tracking error feedback signal to a microprocessor-synthesized reference tracking error signal. The position mode servo feedback loop employs a parallel combination of a synchronous demodulator and a phase-frequency detector to achieve good locking performance over the entire frequency spectrum of the synthesized reference tracking error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.