Image sensor with analog-to-digital converter that generates a variable slope ramp signal
Patent 6545624 Issued on April 8, 2003. Estimated Expiration Date: 
February 8, 2021. 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.
February 8, 2021. 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 ReferencesLarge dynamic range analog to digital converter Low-power column parallel ADC in CMOS image sensors CMOS imager with an A/D per pixel convertor Patent #: 6271785 InventorsAssigneeApplicationNo. 780944 filed on 02/08/2001US Classes:341/155, Analog to digital conversion341/161, Acting sequentially341/169, Input signal compared with linear ramp341/170Input signal compared with nonlinear rampExaminersPrimary: Tokar, MichaelAssistant: Mai, Lam T. Attorney, Agent or FirmInternational ClassH03M 001/12AbstractA programmable analog-to-digital converter (ADC) for use in a CMOS imaging system, the CMOS imaging system having an array of pixels, and the ADC configured to provide a enhanced conversion resolution for pixels providing a low analog voltage level and a relatively coarser conversion resolution for pixels providing a relatively higher analog voltage level.Other References
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