Compact low-noise active pixel sensor with progressive row reset
US6697111B1 · kind B1 · utility
39Cited by
29References
24Claims
0Family size
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Key dates
| Filing date | Apr 8, 1998 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Apr 8, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging array of active pixel sensors uses a compact three transistor CMOS implementation for each pixel. A current source at the top of each column creates a distributed feedback amplifier for each pixel in a selected row. The reset amplifier acts as a variable resistance in the source-follower amplifier feedback circuit. The variable resistance is controlled by a range reset voltage applied to the reset amplifier thereby nulling the photodiode reset noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.