Arrangement for reading information from a magnetic record carrier
US6304396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Feb 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An arrangement is disclosed for reading information from a record carrier. The arrangement comprises a read head having at least one magneto-resistive element (R.sub.mr), a first transistor (Tr.sub.1) and a second transistor (Tr.sub.2). The base of the first transistor (Tr.sub.1) is coupled to the emitter of the second transistor (Tr.sub.2) via a first capacitor (6). The base of the second transistor (Tr.sub.2) is coupled to the emitter of the first transistor (Tr.sub.1) via a second capacitor (8). The arrangement further comprises a non-linear transconductance amplifier (14) having first and second inputs coupled to the output terminals (10,12) of the arrangement, and having and inverting and non-inverting outputs coupled to the bases of the first and second transistor. The non-linear transconductance amplifier (14) is adapted to supply a control current at its inverting and non-inverting outputs in response to a voltage present across its inputs, such that for first and second input voltages resulting in first and second output currents, respectively, the first input voltage being larger than the second input voltage, the amplification factor of the transconductance means being l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.