Bridged T-coil for increased bandwidth in hard disk drive write circuitry
US12159648B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2023 |
| Grant date | Dec 3, 2024 |
| Priority date | — |
| Expiry date | Sep 7, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10342
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Write apparatus for a disk drive includes a write head, write current circuitry connected to the write head for generating a steady-state write current, overshoot current circuitry connected to the write head for generating write current overshoot pulses, and a T-coil termination network between (a) the write current circuitry and the overshoot current circuitry, and (b) a first node connected to a first input of a transmission line together with the write head. The T-coil termination network may include a first inductor connected to the first node, a second inductor coupled with the first inductor at a second node, and a first termination resistor between the first inductor and a common voltage. An output of the overshoot current circuitry may be connected to the first node, and an output of the write current circuitry may be connected to the second node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.