Detection circuit with correlated double sampling with improved anti-blooming circuit
US8921755B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2011 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Aug 4, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/77
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The detection circuit with correlated double sampling comprises two transimpedance amplifiers connected by means of a sampling capacitor. A photodiode is connected to the input of the first transimpedance amplifier. The circuit comprises an anti-blooming circuit connected between the input and output of the first transimpedance amplifier. The anti-blooming circuit comprises means for comparing the output voltage of the first transimpedance amplifier with a setpoint voltage defined by means of the output voltage of the second transimpedance amplifier. The means for comparing are connected to means for applying a feedback current to the input of the first transimpedance amplifier when the difference between the output voltage and the setpoint voltage reaches a limit value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.