EMI noise cancellation in disk drive having MR read head and single-ended preamplifier
US6088235A · kind A · utility
67Cited by
12References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1997 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Oct 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10689
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic noise cancellation in a single-ended MR preamplifier front end is achieved by forming a balanced ground return path in a flex circuit connecting an MR head to the front end of the preamplifier. The balanced ground return path introduces a noise current in the opposite direction of the original noise current as viewed at the signal input pins of the preamplifier chip. In this manner common mode rejection of the radiated noise component is restored in the single-ended MR preamplifier circuit arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.