Video preamplifier with fast blanking and halftone capability on a single integrated circuit chip
US5461398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | May 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and circuit (30) for providing drive signals that have a half-tone and fast blanking capability to a video display (20) has a video preamplifier (31) integrated on a semiconductor substrate (35) for receiving an input video signal (14) and for producing an output drive signal (17) to the video display (20). The preamplifier (31) may have a plurality of channels (31', 31") corresponding to each color video signal to be processed. A halftone control circuit (21), also integrated on the semiconductor substrate (35) receives halftone control signals (60) and connected to reduce the drive signal produced by the video preamplifier (31). A fast blanking circuit (22) for receiving fast blanking control signals (80) is also integrated on the semiconductor substrate (35) and is connected to substantially turn off the drive signal produced by the video preamplifier (31). The preamplifier (31) is constructed with bipolar transistors and the halftone and fast blanking control circuits are constructed with MOS transistors, for example by a LinBiCMOS semiconductor manufacturing process. The preamplifier (31) may include a plurality of amplification stages, (40, 43-45, 48, 50) wherein the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.