Damp circuit for a hard disk drive write head
US6226141A · kind A · utility
3Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1997 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Sep 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/001
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved write drive circuit which reduces the ringing and overshoot transients of an H-bridge drive circuit for a hard disk drive. The invention uses a damp circuit which minimizes the amount of capacitance on the outputs of the write driver while still accomplishing the dampening of the transient ring. In a preferred embodiment, the damp circuit is a ring clamp circuit which includes a resistor connected to each node of the write head. Each resistor is then connected to the emitter of a npn transistor where the transistors have a commonly enabled gate and a common collector connected to a source voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.