NI Multisim：高级的捕捉与设计

高级的捕捉与设计NI MultisimOverviewTransforminga designfrom scribbleson anapkin toan organizedandprofessional schematicis avital stepin anyelectronics design process,and theneed fora productiveyet powerfulcapture toolis critical.As anycircuit designer canattest to,time is a valuablecommodity,and isbetterspent onimportant designwork ratherthan learningthe idiosyncrasiesofa difficult-to-master captureprogram.National InstrumentsMultisimFigure1is aprofessional schematiccapture andcircuit simulationpackagethat hasfocused onproviding powerfuldesign featuresthatintegrate seamlesslyinto theapplication designf1ow.This intuitiveenvironmenthelps anyengineer toeasily,successfully andquickly completetheirdesigns.In projectsof anycomplexity,Multisim sadvanced captureprovidesbenefits byoffering intuitivetools atall levelsof schematiccapture:from thefundamentals ofplacement and wiring,to theadvancedfeatures ofproject managementand communication.Intuitive andEfficient Captureadvancedtasks,andof theseMultisimcombines anintuitive simulationenvironment withcapturefeatures toenhance development,reduce repetitivebecome anassetto anycircuitdesigner.The truebenefits featuresare easilyrealized inMultisim,because theyare implementedwithin aneasy-to-use environmentwithintuitive interfaces.In themajority ofEDA toolstasks suchascomponent selection,placement,andwiringare time-intensive andlaborious.Multisim hasbeen developedto breakaway fromthis arduousmold.Every schematicbegins withthe selectionand placementof components,andas aresult an engineer sinitial taskis tosearch theircapture toolsdatabase forspecific components.Many traditional EDA toolsare lumberedwithdisorganized databasesthat aredifficult tonavigate.In thesetools,component selectionisahurdle in the designprocess.In Multisim,all17,000components inthe masterdatabase arelogically organizedinto easy-tonavigate groupsFigure

2.These groupingsreflect thetype ofdevice andfunctionality,so thatcomponents suchas diodesare inone group,whileop-amps populatea separateanalog group.This logicalorganization mirrorstheway mostmanufacturers presenttheir ownparts libraries,providing anintuitiveinterface thatan engineerhas encounteredmany timesbefore.Figure

2.Multisim databaseorganizationWith componentsselected fromthe database,the engineeris facedwith thesecondfundamental taskin capture:wiring togetherindividual components.Inherently the designprocessis quiteinvolved asan engineercontinuouslynavigates tothe database,searches forand picksa part,and thenwiresit intothedesign.In manytraditionalEDAtools,anengineerwill quicklyrealizethat wiringrequires themto repeatedlyswitch betweenplacementand wiringmodesforeach newcomponent andwire tobe placed.Over thecourseof anentire design,this constantswitching canborder uponpainful foranengineer.In Multisim,this tediumis eliminatedby amodeless environment,where themouse cursors proximityto pinsand otherconnectors willautomaticallyallow thedrawing ofwires Figure

3.The abilityto quicklycreateconnections withoutconstantlyswitching betweendrawing modesmakes thecapture processmuchmore efficient.Figure

3.Effortless wiringintheMultisim modelessenvironmentWith partsplaced andconnections created,even asimple designbegins toevolveinto aschematic ofsize andcomplexity.Devices andwires spanasheet,making thesearch forspecific elementssomewhat。