CST STUDIO SUITE EM联合仿真电路的概述.docx
- 文档编号:8027290
- 上传时间:2023-01-28
- 格式:DOCX
- 页数:11
- 大小:428.77KB
CST STUDIO SUITE EM联合仿真电路的概述.docx
《CST STUDIO SUITE EM联合仿真电路的概述.docx》由会员分享,可在线阅读,更多相关《CST STUDIO SUITE EM联合仿真电路的概述.docx(11页珍藏版)》请在冰豆网上搜索。
CSTSTUDIOSUITEEM联合仿真电路的概述
EM/CircuitCo-SimulationOverview
Overview
SchematicView
AddingCircuitElements
SettingupaSimulationTask
ViewingResults
TransientEM/CircuitCo-Simulation
SeeAlso
SchematicView
TheintegrationofCSTMICROWAVESTUDIO®inCSTSTUDIOSUITE™allowsforastraightforwardcouplingofEMsimulationandcircuitsimulation.
ForeachCSTMICROWAVESTUDIO®structure,twofundamentallydifferentviewsonthemodelexist.Thestandardviewisthe3Dmodelrepresentationwhichisvisiblebydefault.However,inaddition,aschematicviewcanbeactivatedbyselectingthecorrespondingtabunderthemainview:
Oncethisviewisactivated,theschematicviewisshownwherethe3Dstructureisrepresentedbyasingleblock(MWSblock)withterminals:
Theterminalsareaone-to-onecorrespondencetothe3Dstructure’swaveguideordiscreteports.Theschematicviewnowallowsforeasyadditionofexternalcircuitelementstotheterminalsofthe3Dstructure.
AddingCircuitElements
Addingcircuitelementstotheschematicviewisstraightforward.Thegeneralprocedureistoselectacircuitelementfromtheblockselectiontreeanddragitontotheschematicview.Theblockselectiontreeisorganizedintoseveralcategoriescontainingelements.
CircuitelementscanbeaccessedthroughtheCircuitElementsfolder:
Theseelementscannoweitherbedraggedbypressingtheleftmousebuttonontheelementitselforevenmoreeasilybypressingtheleftmousebuttonwhilethecursorisononeoftheelement’sterminals.Notethatanelement’sterminalishighlightedbyaredcirclewheneverthemousepointerislocatedoverit.
Onceanelementisselectedatitsterminalandthendraggedontotheschematicview,areddotwillappearwhenevertheterminalislocatedclosetotheendofanalreadyexistingconnectionline(hereshownfortheRJ45connectorexample):
Releasingthemousebuttontherewillthenplaceandconnectthecircuitelementontheschematic.Redterminallinesillustratethatthislineisstillopen-endedwhereasbluelinesindicateproperconnection.
Selectingacircuitelementbysingle-clickingonitwillrevealitspropertiesintheparameterwindowasshownbelow:
Theelement’spropertiescanbemodifiedintheusualwaybyclickingintothecorrespondingentryfieldandchangingthevalue.
Ground(GND)elementsandportscanalsobeaccessedbydragginganddroppingthemfromtheblockselectiontree(forportsselecttheCircuitElements⇨Sources/Portssection),butconvenientshortcutsexistforthesefrequentlyusedelements:
Shortcut
Description
g
Placeagroundelement.Simplyclickontheendofaconnectionlineafteractivatingthisshortcut.
p
Placeaportelement.Clickontheendofaconnectionlinetoplacetheport
Allelementscanbedraggedwiththemousetoanewlocationwhiletheelementsstayconnectedviatheconnectionlines.Furthermore,afteryouselectanelement,youcanrotateitbychoosingView⇨Tools⇨Rotate/FlipTools⇨RotateLeft(shortcutl)andView⇨Tools⇨Rotate/FlipTools⇨RotateRight(shortcutr),respectively.
Thefollowingpictureshowsanexemplaryexternalcircuitwheretheoriginal8-portstructurehasbeenreducedtoa2-portdevicebyapplyingloadstoalltheotherterminals:
SettingupaSimulationTask
OnceallterminalsoftheMWSblockareconnectedtocircuitelements,anS-parametersimulationofthestructureincludingtheexternalcircuitrycanbeperformed.TheresultingS-matrixwillhavetwoportsintheexampleabove,sinceonlytwoexternalportshavebeenplacedintheschematic(representedbydiamond-likesymbols).
InordertorunanS-parametercircuitsimulation,chooseSimulation⇨Update.Thecircuitsimulatorsupportsavarietyofdifferentanalysisoptions,soyouwillbepromptedtoselectoneofthem:
Notalloftheseoptionsmaybeavailabletoyouduetolicenserestrictions.HereyoushouldselectS-ParametersandclickOK.AdialogboxwillappearinwhichyoucanspecifythesettingsoftheS-parametercalculation:
ThemostimportantsettingistheNumberoffrequencystepshere.ClickingOKwillstarttheS-parametersimulationofthecoupledEMandcircuitproblem.Ifallsimulationresultsofthe3DEMsimulationarealreadypresent,thecircuitsimulationwillonlytakeafewsecondstocomplete.Otherwise,themissingEMsimulationdatawillbeautomaticallycomputedfirst.
ViewingResults
Oncethesimulationiscomplete,theresultswillbeaddedtothenavigationtree.TheProjectsfolderwillcontainalistofsub-folders,eachofwhichrepresentacurrentlyopenedproject.Alldatawillbestoredunderthefolderforthecorrespondingproject.
TheS-parameterswillbeshownastop-levelresultsoftheprojectfolder.SimplyclickingontheS-ParametersentrywillshowtheexternalS-parameters:
Theschematicviewalsosupportstheparameterizationofthe3DmodelinastraightforwardwaybymakingthestructureparametersavailableasblockparametersfortheMWSblock.ThistightcouplingofthedifferentsimulationmethodsallowsfortrueEM/circuitco-simulation.
TransientEM/CircuitCo-Simulation
ThetransientEM/circuitco-simulationisanalternativetothestandardEM/circuitco-simulationthatisavailableforcoupledcircuit-EMproblems.ThestandardEM/circuitco-simulationofCSTDESIGNSTUDIO™usesS-ParameterstodescribeCSTMICROWAVESTUDIOblocks.ThecomputationoftheS-parametersbyCSTMICROWAVESTUDIO®requireseitherafrequencysweepofthefrequencydomainsolver,oronesimulationperportofthetimedomainsolver.TheresultingS-parametersdescribetheblockforanycombinationofportexcitations.
ThetransientEM/circuitco-simulationusesadifferentapproach:
Onlyonesimulationofthecoupledcircuit-EMproblemisperformed,withexactlytheexcitationthatisdefinedinthecircuit.BoththecircuitandtheEMproblemaresolvedsimultaneously.ThisapproachisusuallyfasterthanthestandardEM/circuitco-simulation(especiallyforlargernumbersofports),sincenogeneralS-parametersneedtobecalculated.
ThefollowingconditionsneedtobemetforthetransientEM/circuitco-simulation:
∙ThecircuitmustcontainexactlyoneCSTMICROWAVESTUDIOschematicblock.CSTMICROWAVESTUDIOblocksandCSTMICROWAVESTUDIOfileblocksmayalsobepresent,butthosewillbedescribedbyS-parametersasusualandnottakeadvantageofthetransientEM/circuitco-simulation.
∙TheCSTMICROWAVESTUDIOblockmusthaveoneormoreport.Theportsmaybeofdiscretetype(edgeorfaceports)orwaveguidetype.ForwaveguideportsonlyTEMandquasi-TEMmodesareallowed.Theporttypeofdiscreteports(S-parameter,voltageorcurrent)aswellastheportproperties(impedance,voltageorcurrentvalue)areignored.Thediscreteportsimplydefinesthelocationwherethecircuitvoltageandcurrentisfedintothe3Dstructure.
∙Thecircuitmustnotcontainanyopenpin.
ThetransientEM/circuitco-simulationiscontrolledfromCSTDESIGNSTUDIO™.InordertoperformatransientEM/circuitco-simulation,setupatransientsimulationtaskandselecttheCSTMWSco-simulationoptioninthetaskpage.
ThesetupofatransientEM/circuitco-simulationisverysimilartothesetupoftheS-parametersimulationdescribedabove.OpentheSelectSimulationTaskdialogboxbychoosingSimulation⇨NewTaskfromthemainmenuorNewTask…fromthecontextmenuoftheTasksnavigationtreeitem.InsteadofS-ParameterschooseTransientasthetasktype.Thefollowingdialogboxwillappear:
InordertoperformatransientEM/circuitco-simulation,selecttheCSTMWSco-simulationradiobuttonintheCircuitsimulatorframe.UsingtheSimulationsettingsframe,setthetotalsimulationtimeto5ns.Thenumberofsamplesleftto0(automaticsamplingwillbeusedinthiscase).
Note:
TheEM/CircuitCo-SimulationmakesuseoftheautomaticsteadystatecheckingofCSTMWS.WheneverthefieldenergyinCSTMWSdropsbelowtheaccuracyleveloftheCSTMWStimedomainsolversetting,thesimulationautomaticallystops,regardlessofthetotalsimulationtimeTmax.Forperiodictimesignalsthisbehaviourmaynotbedesired.Inthiscaseyouneedtodisablethesteadystatecheckingbyselecting"Nocheck"inthe CSTMWStimedomainsolversetting.
Tocompletethetransientsimulationtasksetup,markthefirstportintheExcitationsettingsframeandpresstheSignal…button.ThiswillbringuptheExcitationSignaldialogbox:
Hereyoucansimplyacceptthedefaults.Nowthesetupofthetransientsimulationtaskiscompleted,butyouhavenotyetspecifiedwhichvoltagesandcurrentsofthecircuityouareinterestedin.Thisisdonebyso-calledprobes:
Aprobecanbeattachedtoanylinkinyourdesignwhichwillrecordtheassociatedvoltageandcurrentforvisualization.Toinsertaprobe,simplydragitfromtheMiscellaneousfolderoftheblockselectiontreeontothedesiredlink.Inoursimpleexampleweareinterestedinthevoltagesandcurrentsatbothports,soweinserttwoprobes:
NowthesetupofthetransientEM/circuitco-simulationiscompleted,andyoumaystartthesimulationwithSimulation⇨Update.Afterthesimulationhasfinished,theresultsappearbelowtheProbesitemofthenavigationtree.Inthissimpleexampleyou’llnoticetheGaussianpulsefedintoport1appearsatport2withashortdelayandabitofattenuation.Morerealisticexamplesmayofcourseuseanyoftheexcitationsignalsavailablefromtheexcitationsignallibrary(includinguserdefinedsignals).Excitationofmorethanoneportisofcoursealsopossible.Forfurther
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- CST STUDIO SUITE EM联合仿真电路的概述 EM 联合 仿真 电路 概述