Digital pixel sensor with a dynamic comparator having reduced threshold voltage sensitivity
Patent 6707410 Issued on March 16, 2004. Estimated Expiration Date: 
August 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFloating input comparator with precharging of input parasitic capacitors CMOS image sensor with pixel level A/D conversion Patent #: 5461425 InventorApplicationNo. 10226079 filed on 08/23/2002US Classes:341/155, Analog to digital conversion327/65, Differential input341/162, Serial conversions with change in signal341/169, Input signal compared with linear ramp348/301Pixel amplifiersExaminersPrimary: Williams, Howard L.Attorney, Agent or FirmInternational ClassH03M 112AbstractA digital pixel sensor architecture has a comparator located within the pixel and a frame memory located outside the pixel. The comparator is used with additional circuitry to perform analog-to-digital conversion. Replacing the analog-to-digital converter and memory of a conventional digital pixel sensor minimizes many issues associated with conventional digital pixel sensors while preserving the architecture's resistance to noise and speed.Other References
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