Ramp signal generator for double ramp analog to digital converter
US9774811B1 · kind B1 · utility
17Cited by
1References
21Claims
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Key dates
| Filing date | Sep 27, 2016 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Sep 27, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/56
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatuses and methods for image sensors with increased analog to digital conversion range are described herein. An example method may include disabling a first auto-zero switch of a comparator, the first auto-zero switch coupled to a ramp voltage input of the comparator, increasing, by a ramp generator, an auto-zero voltage level of a ramp voltage provided to the ramp voltage input of the comparator, and disabling a second auto-zero switch of the comparator, the second auto-zero switch coupled to a bitline input of the comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.