Low noise sample and hold circuit for image sensors
US7385636B2 · kind B2 · utility
14Cited by
17References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2004 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Jun 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/767
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image sensor includes a plurality of pixels for capturing incident light that is converted to a signal representing an image; wherein noise is combined with a signal representing both the image and a reset level; a plurality of dark reference pixels that generate noise that substantially correspond or equally correspond to the noise in the image and reset level; and a sample and hold circuit that reads out the image signal and cancels or substantially cancels out the noise from the image signal and reset level by canceling the noise from image and reset level with the noise generated from the dark reference pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.