Method and apparatus for performing transmit pre-emphasis
US7551897B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 26, 2006 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Apr 23, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/7236
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pre-emphasis circuit and methods are provided. The circuit includes a first amplifier and a second amplifier. The first amplifier contains M first driver cells and is operable to amplify a signal. The second amplifier contains P second driver cells and is operable to amplify a delayed version of the signal The pre-emphasis circuit further includes logic circuit operable to change a pre-emphasis ratio of the pre-emphasis circuit including switching off one or more of the M first driver cells of the first amplifier and switching on a corresponding one or more of the P second driver cells of the second amplifier, such that a swing amplitude for an output signal provided by the pre-emphasis circuit is maintained at a constant level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.