Apparatus and method for signal handling on GTL-type buses
US5852372A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Transceivers for bus communications using GTL-type transmission-line bus structures provide improved clamping of an initially ON output pulse of a communication bus driver and adds an active pull-up function inside the integrated circuit that does not change the external circuit nor require additional functional external circuit corrections. Receivers may contain an active pull-up for added signal quality improvement Improved clamping and active pull-up allow reduced width of the channel of the N-channel CMOS output transistor. A drive/receive clamp may be added to a sequential pull-up circuit and an active pull-up circuit for better performance at higher frequencies. A related method may comprise first switching OFF an active pull down circuit and switching ON an active pull-up circuit, where the active pull-up circuit clamps the driver output voltage from falling below a first voltage. Then switching OFF a first clamping circuit, where the first clamping circuit clamps the driver output voltage from exceeding a second voltage when the first damping circuit is ON, and where the second voltage is greater than the first voltage. And then switching OFF a second clamping circuit, wher…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.