Differential high speed inductive driver with a bidirectional current limiting output stage
US5696460A · kind A · utility
3Cited by
1References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Aug 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An innovative circuit for driving the write head. All of the driving transistors are NPN, and are prevented from saturation. This is achieved by shifting and scaling down the differential drive applied to the pull-up transistors, to drive the pull-down transistors with levels such that the pull-down transistors cannot reach saturation. This provides a very simple circuit in which all four of the drive transistors are NPN, and all are kept out of saturation. Moreover, the peak write current applied to the head is precisely limited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.