Complementary pair-configured telecommunication line driver having synthesized output impedance
US6359505B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Dec 19, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/541
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A synthetic impedance line driver for driving a telecommunication line includes a complementary operational amplifier pair having cross-coupled positive feedback summing resistors. The driver circuit is configured to provide a relatively large multiplication of the values of relatively small valued output resistors to realize a synthesized impedance matching that of the driven line. A cross-coupled resistor network may be employed to cancel out far end signal components present in an analog canceler drive signal. The values of the auxiliary network resistors are ratioed such that the signal at nodes between resistors of branches of the network is a fraction of the open circuit voltage swing of the amplifiers, with far end signal components canceled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.