Device and method for correcting the reset noise and/or the fixed pattern noise of an active pixel for an image sensor
US7189955B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 2005 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Jun 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device for correcting the reset noise and/or the fixed pattern noise of an active pixel comprising a photosensitive element, the device comprising a transmission circuit connecting the photosensitive element to a correction node and operating with a first or a second transmission gain; a circuit for providing a correction voltage equal to the sum of a constant voltage and of the noise multiplied by an amplification gain equal to the inverse of the difference between the first and second transmission gains; and a correction circuit capable of bringing the correction node from the constant voltage to the correction voltage, the transmission circuit having the first transmission gain, and of bringing the correction node to the constant voltage, the transmission circuit having the second transmission gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.