Image sensing pixels with feedback loops for imaging systems
US8390712B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2010 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Jun 2, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/803
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging system may include an image sensor array formed from imaging pixels with feedback loops. Each imaging pixel may include an amplifier transistor that is controlled by a voltage on a floating diffusion node and may include a feedback transistor connected between the floating diffusion node and column readout circuitry. The amplifier transistor, together with a current source in the image sensor array, may form a common-source amplifier that inversely amplifies the voltage on the floating diffusion node and provides control signals to the feedback transistor. The common-source amplifier and the feedback transistor may create a feedback loop during image readout operations and during image reset operations that clamps the voltage on the floating diffusion node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.