Method and apparatus for converting a low dynamic range analog signal to a large dynamic range floating-point digital representation
Patent 6369737 Issued on April 9, 2002. Estimated Expiration Date: 
October 30, 2017. 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.
October 30, 2017. 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 ReferencesRipsaw analog-to-digital converter and method Camera having an adaptive gain control Patent #: 5614948 InventorsApplicationNo. 960823 filed on 10/30/1997US Classes:341/155, Analog to digital conversion341/169Input signal compared with linear rampExaminersPrimary: JeanPierre, PeguyAttorney, Agent or FirmInternational ClassH03M 001/12AbstractAn analog-to-digital conversion scheme allows the conversion of a small dynamic range analog signal into a floating-point, digital representation with a larger dynamic range. A montonically changing analog signal is reset to a reference value at time t=0. The analog signal is then sub-converted by an analog-to-digital converter with maximum input signal level Ss to corresponding digital representations at several sub-conversion times t=T2 >T1 t=T3 >T2, . . . t=TM >TM-1, where TMࣘT. These digital representations are then suitably combined to produce a cumulative, floating-point digital representation which accurately represents the analog signal even if the analog signal has a value greater than Ss at time t=T.Other References
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