Disk drive with preamplifier for multiple readers in a slider with a common return signal
US8988829B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2014 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Sep 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disk drive embodiments with common lead connections in the slider, suspension, and preamplifier are described. The arm electronics IC includes a preamplifier with single-ended input from the set of signal traces that include a common signal return lead for the plurality of read transducers (readers) in the slider. Two embodiments of the preamps are described that include a single-ended design and a pseudo-single-ended design. Each embodiment supplies the required bias to each read transducer using an operational transconductance amplifier (OTA) that drives a variable current source connected to the transducer. The positive input to the OTA is a DC voltage with the AC signal from the transducer imposed on it. The negative input is a DC reference voltage. Various embodiments of the signal trace configuration on the suspension are described including a single and double layer embodiments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.