Method and apparatus for controlling the common-mode output voltage of a differential buffer
US5939904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1998 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45224
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and device for controlling the common-node output voltage of a differential buffer is disclosed. According to the invention, the common-mode output voltage of the differential buffer is controlled to a desired value by supplying a first current to the output of the differential buffer and supplying a second current to the output of the differential buffer, the second current being opposite in polarity and lower in magnitude than the first current. The common-mode output voltage of the differential buffer is sensed and an adjustment current is added to the second current to adjust the common-mode output voltage to the desired value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.