Readout circuitry to mitigate column fixed pattern noise of an image sensor
US9819890B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Aug 17, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques and mechanisms to mitigate fixed pattern noise in image sensor data. In an embodiment, readout circuitry includes an adaptive analog-to-digital converter (ADC) comprising a differential amplifier and a feedback path coupled across the differential amplifier, where the ADC is to receive a ramp signal, a control signal associated with a transition rate of the ramp signal, and an analog signal generated by one or more pixels. In another embodiment, the feedback path and/or one or more other circuit elements coupled to the differential amplifier are configured, based on the control signal, to provide one of multiple loop gains with the differential amplifier. The ADC provides a digital output to determine a comparison based on the ramp signal and the analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.