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US Patent 6545624 - Image sensor with analog-to-digital converter that generates a variable slope ramp signal
US Patent Issued on April 8, 2003
Estimated Patent Expiration Date:
February 8, 2021Estimated 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.
Estimated Patent Expiration Date:
February 8, 2021Estimated 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.AbstractA 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
| 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 rampField of Search341/161, Acting sequentially341/162, Serial conversions with change in signal341/163, Recirculating341/169, Input signal compared with linear ramp341/170, Input signal compared with nonlinear ramp341/155Analog to digital conversionExaminersPrimary: Tokar, MichaelAssistant: Mai, Lam T. Attorney, Agent or FirmUS Patent References4843395, Large dynamic range analog to digital converterIssued on: 06/27/1989 Inventor: Morse6137432, Low-power column parallel ADC in CMOS image sensors Issued on: 10/24/2000 Inventor: Xiao6271785CMOS imager with an A/D per pixel convertor Issued on: 08/07/2001 Inventor: Martin, et al. International ClassH03M 001/12 |
