Data network line driver
US5077756A · kind A · utility
7Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 31, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | May 31, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/40
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A line driver for a cable linked LAN maintains a high impedance across the cable when not sending data. A pulse transformer includes a primary and secondary winding. The primary winding of the transformer is placed between a first pair of transistors and a second pair of transistors. An array of switching inverters activates these transistors in such a manner whereby, when one pair is turned on, the other pair is turned off. This "off" and "on" toggling of the transistor pairs drives current into the transformer primary. Such current induces a pulse in the transformer secondary which is coupled into the LAN cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.