Circuit for transferring high voltage video signal without signal loss
US6140993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Jun 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0289
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for transferring high voltage analog video signals while enabling the use of conventional low voltage logic levels includes a first transistor powered by a high voltage power source to bias a pass transistor at a high voltage level. The pass transistor receives a high voltage video signal and because of the high voltage bias is able to pass the video signal without attenuation of the signal due to feedthrough effects, thus preserving the fidelity of the video signal. A second transistor provides a ground potential which operates to turn OFF the pass transistor, thus disabling the transfer of the video signal therethrough. A third transistor operatively coupled to the first transistor operates to turn OFF the first transistor when the second transistor is in operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.