Push-pull readout of dual gate CID arrays
US4862276A · kind A · utility
Inventors
Key dates
| Filing date | Oct 7, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Oct 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to charge injection devices (CID) for sensing IR image intensity information obtained from a two dimensional array of dual-gate sensing sites on an InSb or HgCdTe substrate, and more particularly to a novel push-pull readout circuit which eliminates the pedestal due to capacitive coupling between gates on the same pixel of a dual gate CID. The CID is scanned in rows and read out in parallel columns. Pedestal cancellation is achieved in one example by resetting the prior row as a selected row is injected. In a second example pedestal cancellation is achieved by adding an additional row which is reset as each row is injected, while in a third example a pedestal cancellation network is provided associated with each column output circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.