Write channel having preamplifier and non-uniform transmission line
US6798597B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Dec 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high speed data transmission channel, preferably embodied in a circuit for writing to a read channel for a hard disk drive, is provided. The channel includes a preamplifier writer, a non-uniform transmission line, and a head. The writer is configured to transmit pulses to the head via the transmission line at a transmission speed. Each pulse has a pulse width. Each pulse may experience interference. The writer is also configured to eliminate interference to each pulse by causing the interference to occur in a differential mode, which causes the interference to cancel out. A transmission time for each pulse is inversely proportional to the transmission speed. The non-uniformity of the transmission line may entail an exponential broadening of a trace width of the transmission line such that when the pulse width is greater than or approximately equal to the transmission time, the pulse propagates from the writer to the head substantially undistorted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.