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1、-------杭州电子科技大学硕士学位论文（4）对上述PSO算法性能分析的基础上，提出了改进的粒子群优化算法，并在最后程序设计实现上加入了JAVA的多线程编程机制，取得较好的运行效果。关键词：粒子群优化，进化算法，器件模型，表面势，JAVA，应用II-----------万方数据-----------杭州电子科技大学硕士学位论文ABSTRACTCompactmodelsplayanimportantroleinconnectingthedevelopmentofthemanufacturingprocessandcircuitdesign.Theirmainfunctionistoacc
2、uratelyreproducethetinycharacteristicsofdevice,thistodigital,analog,mixedsignalandRFICdesigniscritical.Indeepsub-microntechnology,thefeaturesizeskeepshrinking,approachingthephysicallimits,MOSFETalsoemergedmanydifferentnewphysicaleffectswhichhavenotconsideredbefore.Alsowiththedecreaseofthesize,the
3、powersupplyvoltagedrop,havingagreaterinfluenceonthemoderateinversionzone,thusrequirementsaccuratelyandphysicstodescribethemoderateinversionzone.Obviously,thetraditionalthresholdvoltagemodelisdifficulttomeettheincreasinglydemandingcircuitdesignrequirements,thisisbecausethethresholdvoltagemodeluses
4、apiecewiseform,namelythedevicesworkindifferentareawithdifferentequation,somewithnophysicalmeaningoffittingparametersconnecttheseequations.Basedonsurfacepotentialmodelwiththeadvantagesofbetter,morefullydescribesthephysicalcharacteristicsofthedevice,andcomparedwiththethresholdvoltagemodelismoreflex
5、iblebecomethestandardofanewgenerationcompactmodels,becomethemainstreamofmodelingmethod.Surfacepotentialmodelisdifferentfromthepiecewiseformofthethresholdvoltagemodel,butuseasetofunifiedequationtodescribetheelectricalcharacteristicsofthedevice,includingthethresholdarea,lineararea,saturatedzone,wea
6、kinversionregionandstronginversionregion,eachworkspaceisconsistentcontinuous.Thesurfacepotentialmodelhastheadvantageoflessmodelparameters,physicalcharacteristics,highprecision,anditsprincipleisthroughderivethechannelofsurfacepotentialequation,andthereasonisthattheparticlesofthechannelcanbeaverygo
7、odcharacterizationofthedifferentphysicaleffects,thenaccordingtotheobtainedfromsolvingthesurfacepotentialcanderivetheother150-400parametersinthedevicemodel.Butwhytheoriginaldevicemodelisnotdirectlyselectsurfacepotential
