Anti-blooming circuit for CMOS image sensors
US6633028B2 · kind B2 · utility
9Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 17, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Aug 17, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/186
Abstract
An improved image sensor constructed from a photodiode and a transimpedance amplifier having an input connected to the photodiode. The present invention utilizes a clamping circuit to prevent the potential at the input of the transimpedance amplifier from causing the photodiode to become forward biased. In the preferred embodiment of the present invention, the transimpedance amplifier includes a transistor connecting the input to the output, and the clamping circuit includes a circuit for holding the gate of the transistor at a clamping potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.