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1、有源像素CMOS图像传感器读出电路的研究湖南大学硕士学位论文有源像素CMOS图像传感器读出电路的研究姓名：李晓幕申请学位级别：硕士专业：微电子学与固体电子学导教师：曾云20070525有源像素CMOS图像传感器读出电路的研究Abstract有源像素CMOS图像传感器读出电路的研究Withtherapiddevelopmentofmicroelectronics,theprocessdevelopsfromsub-microntodeepsub-micron.TheperformanceofCMOSimagesensorhasreachedandeve
2、nexceededCCD's.CMOSimageseneorbecomesthefocusofimagesensor.Inthispaper,thedevelopinghistoryandpresentsituationofCMOSimagesensorinsideandoutsideofChinaweresummarized.ThecharacteristicsbetweenCMOSimagesensorandCCDimagesensorwerecomparedandtheresearchpurposeandmeaningwaspointedout
3、.Onthebasisofintroducingsemiconductorphotoelectriceffect,thecharacteristicsofthePNjunctioninthestateofthermalequilibriumconditionsandilluminationconditionwasanalyzedindetail.ThePhotoelectriccharacteristicsofphotodiodeusedinCMOSimagesensorweredeeplydiscussed,anditsI-Vcharacteris
4、ticandequivalentcircuitwasgiven.TraditionalphotodiodeactivepixelusedNMOSFETastheresettransisitor,whichexistedthresholdlossintheprocessofsignaltransmission.thismadetheoutput-swingofthecircuitwasrestricted.InthepaperapixelstructureinwhichaPMOSFETwasusedtoreplacetheNMOSFETastheres
5、ettransisitorwasproposed,andthetransisitorsofitwerealldesignedoptimization.UsingsoftwareHSPICEtosimulate,theresultsshowedthattheimprovedpixelcircuithadahighoutput-swingandahighdynamicrange.ThereadoutcircuitisanimportantelementoftheCMOSimagesensor,thetraditionalCDScircuitwasanyl
6、yzedanditsperformancewassimulated.TheconventionalCDScircuitneedstwesample-holdcircuits,inwhichasample-controlMOStransisitor,asample-holdcapacitanceandanoutputbufferareneeded.Afterthat,apublicdifferentialamplifierisalsoneededtorealizethedifferentialoutput.Theusedoflargenumbertra
7、nsistorsoccupiedalotofthechiparea,andincreasetheconsumptionofthecircuit.InthepaperanewstructureofthereadoutcircuitCDSstructurewaspresented,thecircuitisnotonlysimpleinstructure,butalsolowpowerconsumption,lownoiseandsingle-endedoutput.Thesimulationresultshowedthatatthecircumstanc
8、esofthepowersupplyvoltageof1.8V,thepowerdissipationoft
