Differential line driver
US6411136B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Mar 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0266
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A fully differential line driver, especially for twisted copper pairs. It includes two current amplifiers made in standard CMOS technique, each having an input and an output, the latter being connected via terminal resistors to a voltage source, which may be set to a larger voltage than that used for driving the CMOS amplifiers. Accordingly, a low output impedance can be combined with a large swing. Further, feedback is not necessary, avoiding problems like potential instability. A very low-impedance input makes it appropriate for connecting to a DAC, thus reducing distortion of its output signal. The driver is suitable for very-high-speed-digital-subscriber-line modems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.