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1、基础版图技术毕业论文中英文资料外文翻译文献7外文资料原文外文资料原文ICMaskDesign:EssentialLayoutTechniquesChristopherSaintandJudySaintCommonSenseNoiseSolutionsLet’sgothrougheachoneofourrealwordrockbandsolution,oneatatime.Wewillseehowtheymapacrosstomaskdesigntechniques—whatwecandoinboththedesignworldandthel
2、ayoutworldtoachievesomeofthesenoisereductions.TurnDownthevolumeOurfirstrequestwastoasktherockbandtoturndowntheirmusic.Turningdownthevolumewouldbelikereducingthesignalswinginacircuit.Inlayoutthereisnotalotwecandotoreducethesignalswing.BysignalswingImeantheamplitudeorvalueof
3、thevoltagethatisbeingwiredaroundthechip.Inadigitalcircuit,forinstance,thezerostateisrepresentedby0volts,whereastheonestatecanberepresentedby5volts.Thisisavoltageswingof5volts.Now,ifweweretoreducethatvoltageswingtoonly2volts,thenwewouldbeswitchinglessenergyeachtimeaflip-flo
4、pflips.Orflops.Thatisthedirectequivalentofturningthenoisegeneratordown,turningthevolumedown.Aswementionedintheopeningthoughtstothischapter,mainlythedigitalpartofamixedsignalchipisthesectionthatneedstobequieted.So,ifyoucangetadigitallogicfamilythatisinherentlyquiet,i.e.,tha
5、thasverysmallvoltageswings,thenthathelpskeeptheoverallnoisedownfromthestart.Voltageswingisnotprimarilyalayoutissue,butiscanbe,toacertainpoint.Supposeyourcircuitdesignerscomealongandsaytheyhaveachipforyoutolayout,withareasonablyhighchunkofdigitalcircuitry.Theyhaveindicatedt
6、hattheyplantousethiscertainlibrary,whichyouknowisa5-voltswinglibrary.Yourememberthatyouusedadigitallibraryonasimilarchipsometimebackthathada2-voltlogicswing.7外文资料原文Youcanturnaroundandsay,“Well,areweworriedaboutnoise?Becausethereisthis2-voltswinglibrarythatcoulddothekindsof
7、thingsyouwant.Thatmighthelp.”Andtheymightagree.Theamountofvoltageswingismainlyacircuitdesigner’sdecision,butagoodmaskdesignerknowstheoptionsandwhentosuggestthem.RockBandMovesInsideTheirHouseTheseconditemwetalkedaboutwasaskingtherockbandtogoinsidetheirhouse.Thehouseprovided
8、someisolation,somesoundinsulation.Thesoundhadtogetthroughthewallsofthehousebeforeitgottoo