Pre-amplifier input stage for multi-element magneto-resistive heads
US8988803B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2014 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Aug 8, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Individual magneto-resistive read elements are connected to the pre-amplifier through a multi-conductor transmission line; one side of each magneto-resistive read element is taken to a single common lead which is also received in the read pre-amplifier. Amplification and bias control are performed by the read pre-amplifier. A low-noise input stage amplifier configuration accommodates a shared common lead in a multi-head environment. Means for independently biasing the magneto-resistive read elements are also provided. Feedback loops are employed to regulate the operating points of the input stages, and to set the potential of the common head terminal. Two-dimensional magnetic recording system testability is enhanced by ability to multiplex any head to a single system output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.