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1、西北工业大学硕士学位论文电路CAD中的元件库建立及自动布线研究姓名：吴琼申请学位级别：硕士专业：机械设计及理论指导教师：廖达雄20030101STUDYONCONSTRUCTIONOFCOMPONENTLIBRARYANDAUTOROUTINGINCIRCUITCADABSTRACTTheComputer-AddedDesign(CAD)inelectron&circuitisanewtechnologyhavingbeendevelopedfor50yearssincethe50slastcentury.Itsappe
2、arancebringsnewlifetoconventionalcircuitdesign.ThispaperdescribesthegeneraldevelopmentalsituationofCADforelectriccircuitandtheprimarystructureofcircuitCADsoftware.Furthermore,thispapermakesapreliminarystudyoncircuitCADsoftware.Firstly,constructelectroniccomponent
3、library.ElectroniccomponentlibraryisanimportantpartofcircuitCAD.Thispaperanalysesagreatdealoffiguresofelectroniccomponentincircuitschematic,drawsoutsomeelementaryfiguresthatcomprisedthesecomponentfigures,designstheirstoragestructures,andbuildingcomponentfilesanda
4、fterwardsunitsthesefilesintoonecomponentfiguresdatabase.Whendisplayingtheseelementaryfiguresoncomputerscreen,webringforwardanewmethodtodisplayasegmentofcubicB-splinecurvewhichissmootherthanthatbyusualmethodSecondly,generatenetlist.Netlististheinterfacebetweencirc
5、uitschematicandprintedcircuitboard(PCB),andalsoapreconditionofelectronicdesignautomatic(EDA).Thepaperanalysestherelationshipbetweeneverycomponent,withparticularattentionbeingpaidtothetopologicalrelationshipbetweenseveraltypesofwire,unifiesthesetypesofwireintoonea
6、nddesignsitsstoragestructure.Throughaseriesofoperationsonwiressuchassplitting,attaching,merging,etc,weconvertwiresgotfromcircuitschematicintounitwires.Atlength,weexportthenetlistinvirtueofdatastructuretree.Duringaboveprocesses,weputforwardotherconceptssuchemptywi
7、re,fullwire,virtualwire.Finally,thisdissertationpresentsthehistoryandcurrentstatusofautoroutingalgorithminPCB,andgivestheprimaryideaofline-searchroutingalgorithmbasedonfigure.AllprogramsreferredinthispaperhavebeenrealizedincomputerbyusingC++language,andtheexpecta
8、ntobjectiveisattainedKeywords:circuitCAD,componentlibrary,B-splinecurve,netlist,autorouting西北]业大学硕十学位论文第一章绪论1.1计算机辅助设计基本概念计算机辅助设计(CAD-Computer-AidedDesign)是指借助
