Method and apparatus for controlling write current in writer drivers
US6744578B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Jan 21, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique and associated circuitry are provided for measuring a buffered write head voltage, and measurement of thin-film write head DC head voltage in a disk-drive, along with a procedure for calibrating/optimizing the write current amplitude based on the measurement of the buffered write head voltage. A write driver includes a terminating resistor, coupled to the write element of a transducer head in a disk drive, wherein controlling the write current of the write driver includes the steps of measuring the resistance RW of the terminating resistor; measuring the resistance RC of the write element; and generating the write current amplitude based on the resistances RC and RW.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.