Method and system to differentially enhance sensor dynamic range using enhanced common mode reset
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United States of America Patent
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Feb 13, 2007
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app pub date -
Apr 19, 2005
filing date -
Apr 11, 2003
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Abstract
Effective differential dynamic range and common mode rejection in a differential pixel detector are enhanced by capturing and isolating differential detector charge output before using common mode reset to avoid detector saturation due to common mode components of optical energy to be detected. Differential charge is stored into an integration capacitor associated with an operational amplifier coupled to receive as input the differential detector outputs. Common mode reset is achieved by resetting storage capacitors coupled to the outputs of the differential detector at least once within an integration time T before storage potential exceeds a saturation voltage V.sub.sat for the photodetector.
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