A charge pump for driving CMOS active pixel reset-中国期刊网

摘要 ToovercomethelimitationoflowimagesignalswingrangeandlongresettimeinfourtransistorCMOSactivepixelimagesensor,achargepumpcircuitispresentedtoimprovethepixelresetperformance.Thechargepumpcircuitconsistsoftwostageswitchcapacitorserialvoltagedoubler.Cross-coupledMOSFETswitchstructurewithwellcloseandopenperformanceisusedinthesecondstageofthechargepump.Thepixelresettransistorwithgatevoltagedrivenbyoutputofthepumpworksinlinearregion,whichcanaccelerateresetprocessandcompleteresetisachieved.Thesimulationresultsshowthatoutputofthechargepumpisenhancedfrom1.2to4.2Vwithvoltageripplelowerthan6mV.Thepixelresettimeisreducedto1.14nsindark.Imagesmearduetonon-completelyresetiseliminatedandtheimagesignalswingrangeisenlarged.ThechargepumpissuccessfullyembeddedinaCMOSimagesensorchipwith0.3×106pixels.

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A charge pump for driving CMOS active pixel reset

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A charge pump for driving CMOS active pixel reset

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