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1、CCD成像系统中模拟前端噪声的研究摘要：为了提高CCD成像电子学系统的信噪比，设计了3种模拟前端电路，借助Oread软件对它们的输出波形进行比较，分析电路结构与噪声产生机理的关系，从理论上比较3种电路结构的噪声水平。然后采用三线阵CCD探测器KLI8023和视频处理器TDA9965在硬件上实现3路模拟前端的电路设计，并通过X64-LVDS采集卡分别将3路图像信息显示在终端机上。毎个像元成像50次，统计这50次的均方差（噪声）和信噪比，通过拟合曲线比较三路模拟前端的噪声水平和信噪比。在相同光照条件下，第1路的信噪比达到7
2、50dB,第3路只有600dB，验证了理论分析的结果，讨论不同像元频率、带宽与信噪比的关系，为今后的成像系统电路设计提供参考和实验依据。关键词：CCD成像系统；模拟前端；噪声；信噪中图分类号：TN386.5-34文献标识码：A文章编:1004-373X(2011)24-0113-05ResearchofNoiseatAnalogFrontEndinCCDImagingSystemZHANGHang,LIUDong-bin,LIWei,ZHANGDa(ChangchunInstituteofOptics,FineMech
3、anicsandPhysics,ChineseAcademyofSciences,Changchun130033,China)Abstract：Inordertoincreasethesignalnoiseratiooftheimagingsystem,threekindsoftheanalogfrontenddesignareproposed.BytheelectronicanalysissoftwareOread,thedifferentoutputwaveformofthethreekindsofdesignar
4、econtrastedforanalyzingtherelationshipbetweenthecircuitandthemechanismofnoisegeneration.Thenoiselevelofthethreecircuitswascomparedtheoretically.ThePCBdesignofanalogfrontendisfinishedwiththree-linearrayCCDKLI-8023and12bitanalog-to-digitalinterfaceTDA9965.Theimage
5、informationisdisplayedontheterminalcomputerthroughtheframegrabberX64-LVDS.Everypixelimages50times,andthenthemean-squaredeviation(noise)ofthe50ResearchofNoiseatAnalogFrontEndinCCDImagingSystemZHANGHang,LIUDong-bin,LIWei,ZHANGDa(ChangchunInstituteofOptics,FineMech
6、anicsandPhysics,ChineseAcademyofSciences,Changchun130033,China)Abstract：Inordertoincreasethesignalnoiseratiooftheimagingsystem,threekindsoftheanalogfrontenddesignareproposed.BytheelectronicanalysissoftwareOread,thedifferentoutputwaveformofthethreekindsofdesignar
7、econtrastedforanalyzingtherelationshipbetweenthecircuitandthemechanismofnoisegeneration.Thenoiselevelofthethreecircuitswascomparedtheoretically.ThePCBdesignofanalogfrontendisfinishedwiththree-linearrayCCDKLI-8023and12bitanalog-to-digitalinterfaceTDA9965.Theimage
8、informationisdisplayedontheterminalcomputerthroughtheframegrabberX64-LVDS.Everypixelimages50times,andthenthemean-squaredeviation(noise)ofthe50timesiscalculated.Thenoi
