Method to adjust the signal level of an active pixel and corresponding active pixel
US7224389B2 · kind B2 · utility
43Cited by
5References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 2001 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Oct 23, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active pixel comprises a sensor circuit for collecting radiation induced charges and transducing them to a measurement signal corresponding to the amount of charge collected, and a capacitor element with two nodes, where the measurement signal is present on a node of the capacitor element. The memory circuit is clocked, i.e. driven by a pulsed signal. The pulse on the memory circuit will rise the reset level at the output, which is lowered due to threshold voltage losses in the active pixel circuit, thus restoring a large signal swing. Arrays of the pixels are described, as well as a method for reading out such a pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.