Differential line driver circuit
US6522179B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Sep 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0278
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential line driver circuit having an output impedance matched to the line impedance includes first and second input terminals for the application of an input signal, a fully differential operational amplifier having inverting and non-inverting signal inputs connected to first and second input terminals respectively, first and second signal outputs providing in-phase and quadrature amplified output signals, and gain adjusting impedances connected between the input terminals and the amplifier's signal inputs. First and second feedback impedances connect between inverting and non-inverting signal inputs of the amplifier and its first and second signal outputs. First and second matching impedances connect first and second amplifier outputs to corresponding output terminals of the line-driver circuit. First and second positive-feedback impedances connect the first and second output terminals of the line driver circuit to the non-inverting and inverting inputs of the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.