Digitally programmable differential attenuator with tracking common mode reference
US5742204A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45479
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential attenuator and method for providing an attenuated differential output in which an AC common mode component has been reduced. The attenuator includes (a) a voltage divider with two resistive elements for providing the attenuated differential output and a common mode node between the two elements, and (b) a differential amplifier for generating a DC common mode reference which is substantially the same as the DC common mode component in the outputs of the differential amplifier. The differential amplifier has a common mode output connected to the common mode node to provide the DC common mode reference thereto so that the AC common mode component is reduced in the attenuated differential output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.