Low noise preamplifier for a magneto-resistive head tester
US5841318A · kind A · utility
17Cited by
3References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Jan 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an apparatus and method for amplifying a signal from a MR element of a hard disk drive magnetic recording head having a DC component and an AC component. The apparatus includes an amplifier circuit that amplifies the signal. An offset corrector circuit is coupled to the amplifier circuit and generates an offset signal representative of a complement of the dc component of the signal. A circuit is coupled to the amplifier circuit and the offset corrector circuit that combines the signal and the offset signal to provide an output signal representative of the AC component of the signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.