可消除时间延时积分型CMOS图像传感器中3管像素复位噪声的读出方法（英文）.pdf

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1、第48卷第1期南开大学学报(自然科学版)Vo1．48NO_12015年2月ActaScientiarumNaturaliumUniversitatisNankaiensisFeb．2015ArticleID：0465—7942(2015)O1—0077—08AReadoutSchemeAppliedinTDICMOSImageSensorfor3TPixelResetNoiseCancellationXuChao，GaoJing，GaoZhiyuan，HanLiqiang，Ya0Suying(SchoolfElectroni

2、cInformationEngineering，TianjinUniversity，Tianjin300072，China)Abstract：Areadoutschemeisproposedforthecancellationofresetnoiseinathree—transistor(3T)time—delayintegration(TDI)CMOSimagesensor．Across—rowdoublesamplingtechniqueisadopted，wherethetwolevelsperformingsubtr

3、actionoperationcomefromtwodifferentrowsofpixels．Togetherwiththeoptimizedrollingshutterscheme，theresetnoisecomponentcanbecancelledintheprocessofTDIaccumulations．Theproposedschemehasbeenevaluatedbyasimulationandtheresultshaveverifieditsvalidity．Keywords：3Tpixel；reset

4、noise；time—delayintegration；CMOSimagesensorCLCnumber：TN453Documentcode：A0Intr0ductionTime—delayintegration(TDI)imagesensorsareusedinapplicationswherealine——scansystemisre—quiredforhigh—quality，lownoiseandhighcontrastimagingevenunderlowilluminationconditions．TheTDIc

5、amerashavebeenimplementedforyearswithcharge—coupleddevices(CCD)sensorswheretheTDIfunctionalityisalmostintrinsicallyavailable[．RecentlytheCMOSTDIimagesensors(CIS)havebeenstudiedfortheiradvantagesofprocessaccessibility，reducedcost，robustnesstoionizingradi—ation．andso

6、onE23]．WithregardtothesensitiveelementofaCIS，althoughafour—transistor(4T)pix—elcanachieve1owerdarkcurrentcomparedwiththree—transistor(3T)pixel，itneedsmorecustomim—plantsandoftensuffersfromthecharge—transferproblem。especiallyforaphotodiodeoflargesizeL．The3Tpixelisfr

7、eeoftheproblems，buttheresetnoise，mainlythekTCnoise，couldnotbeeasilyre—movedbytheconventionaldoublesamplingtechniquein3Tpixel，whichgenerallyaccountforthemainpartofthenoisefora3TCIS．Somestudieshavebeendonetomakethe3TpixelavailableforTDIapplication．InreferenceE53，thep

8、ixelconsistsofnotonlythedetectingcellbutalsoasampleandholdstructurewiththreestoragecapacitors．Thestructureallowsatruecorrelateddoublesampling(CDS