Magnetoresistive head amplifier
US5331478A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Oct 7, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An amplifier for biasing and amplifying the signals produced by a magnetoresistive element is provided. The input stage of this circuit includes two transistors in a differential common base configuration having a low input impedance. Since the two transistors are coupled to separate identical current sources, balance between the currents through the two transistors is maintained. The currents are balanced without the use of a feedback loop. Additional input stages may be added to allow signals from additional magnetoresistive elements to be selected and amplified. By using a common mode switching configuration, switching transients are greatly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.