High speed FIR transmitter
US6680681B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2003 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | May 8, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/742
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transmitter for driving a transmission medium employs pre-distortion to predistort the signals leaving the driver so that they will have an acceptable shape when they reach their destination and have been distorted by imperfections in the transmission medium. The change to pulse height is accomplished by means of a current steering unit that directs a controllable amount of current into the line for each pulse while maintaining the total sum of current that is generated constant in order to reduce noise. Control coefficients for the current steering unit are manipulated in an nxm register that automatically maintains the total number of bits constant while bits are moved from a location that controls a first current driver to a location that controls a second current driver with different properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.