Write head current damping with dynamic coupling
US6680809B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2000 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Oct 12, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A write head circuit is provided having improved transient and steady state response. The circuit includes a dynamically coupled damping circuit that is coupled to the write head during transient periods of a write signal to substantially reduce or eliminate overshoot generated by a write head cable. During steady state or data writing periods, the damping circuit is decoupled from the write head to prevent unnecessary loading of the write head. In preferred embodiments, the damping circuit includes a resistor in series with a capacitor, and the damping circuit is coupled in parallel to the write head. The resistor substantially reduces the overshoot of a write signal supplied to the write head, while the capacitor decouples the resistor from the write head during steady state or data write periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.