Voltage-mode driver with pre-emphasis
US8415986B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2010 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Mar 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0272
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A voltage-mode driver circuit supporting pre-emphasis includes multiple resistors, and multiple transistors operated as switches. Control signals operating the transistors represent a logic level of an input signal to the driver circuit. To generate a pre-emphasized output, the transistors are operated to connect a parallel arrangement of the resistors between output terminals of the driver and corresponding constant reference potentials. To generate an output in the steady-state, the transistors are operated to connect some of the resistors across the output terminals of the driver, thereby reducing the output voltage. A desired output impedance of the driver, and a desired level of pre-emphasis are obtained by appropriate selection of the resistance values of the resistors. The current consumption of the driver is less in the steady-state than in the pre-emphasis mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.