Write driver with improved boosting circuit and interconnect impedance matching
US7365928B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 13, 2005 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | May 31, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A write driver driving a write current through a head connected to the write head by an interconnect. The write driver includes a circuit matching output resistance to the odd characteristic impedance of the interconnect and a voltage boosting circuit. The voltage boosting circuit in connected between a high voltage reference or supply voltage and a low voltage reference, and includes a pair of current sources, such as MOS transistors, connected to the input node of a single capacitor. During the overshoot duration, the current sources selectively operate at saturation to generate a pulsed current with an amplitude of half the load current. The recharge of the capacitor is done with the load current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.