Magnetic recording disk drive with write driver to write head transmission line with multiple segments having different numbers of conductive traces
US9036305B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2013 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Nov 18, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/0323
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multiple-segment transmission line in a hard disk drive enables a wider optimization range of the slope, duration and amplitude of the transmission line overshoot (TLO) wave shape. There is a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head and at least two intermediate segments. The number of traces in a segment is different from the number of traces in the segments to which the segment is immediately connected. There is an even number of traces in each segment and the traces in each segment are interleaved. The number of segments and the number of traces in each segment can be selected to achieve the desired impedance levels for the different segments to achieve the desired wave shape for the TLO. All of the traces on the transmission line are preferably coplanar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.