Differential line driver employing predistortion
US5204880A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Apr 23, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/62
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A two terminal line driver employing predistortion is disclosed, for driving data over a lossy transmission line such as a twisted pair cable at speeds on upwards of 10 Mbit/s. The driver is designed for voltage output operation wherein fullstep and halfstep information is actively encoded into a voltage level provided for at the output terminals. The driver provides a fullstep voltage spanning the supply rails and a halfstep voltage having a selectable controlled amplitude of a predetermined value. Fat bits resulting from the biphase encoding format are predistorted by dropping the amplitude to a predetermined value, equalizing the relative power content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.