Voltage-mode driver with pre-emphasis, slew-rate control and source termination
US6704818B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Feb 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/0005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention provides an apparatus, method, and means for maintaining a constant slew rate while providing pre-emphasis, to adapt a push-pull voltage driver to the interconnect that it is driving. In an aspect, the invention modifies a driver output voltage amplitude, providing a small swing out for low frequency signals, and a large swing out for high frequency signals, such that low frequency signals and high frequency signals reach a receiver with equal amplitude. In an aspect, a slew rate control, having a delay mixer, selects and individually transmits to individual segments of a driver leg, at a desired time, one of output data and a signal for a pre-emphasis version of output data. In an aspect, the invention maintains a matched direct current termination impedance to the characteristic impedance of a transmission line being driven.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.