layout_quick_start_ledit_1_1.pdf

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1、LayoutDesignQuick-StartGuide(usingTannerLeditstudenteditionsoftware)InitialSetupWhenstartinganewlayoutdesignfirstcreateanewprojectdatabaseandthancreateoneormoreCells.CreatinganewprojectdatabaseFromthemenuchoose:File->NewClickonBrowsetochoosetheappropriatetechnologyfile:Selectmhp_ns5.tdbClick

2、onOpenthanclickonOK.CreatingaNewCellFromthemenuchoose:Cell->Newlayout_quick_start_ledit_1_1.doc1TypethenewcellnameandclickonOK.SettinguptheGridTheon-screengridstepshouldbesetto1lambdaandthemousestepto0.5lambda.Fromthemenuchoose:Setup->DesignThescreenshowsthefollowingimportantinfo:·Thetechnol

3、ogyname–SCN3MSUBlayout_quick_start_ledit_1_1.doc2·Thefactthattechnologyislambdabased·1lambda=3/10=0.3micronsNowclickontheGridtab.Thescreenshowsthat:·Thegridstepissetto1lambda(inthistechnologysetuponelocatorunitequalsonelambda);·Themousewillsnapto0.5lambdalayout_quick_start_ledit_1_1.doc3Exam

4、ple1–TheSimplestMOSTransistorInthisexamplewewilldrawaminimumsize(L=2lambda,W=3lambda)N-MOStransistor.TheFinalLayoutThefinallayoutofthesimplestNMOStransistorandthelayerscolorcodesareshownbelow:Step-by-StepInstructions1.ActiveSelecttheActivelayerfromtheLayer’sPaletteChoosetheBoxtoolfromtheDraw

5、ingToolbar.layout_quick_start_ledit_1_1.doc4Nowdrawa8lambdawideby3lambdahighrectanglestartingatcoordinate2,2andfinishingat10,5.2.NSelectSelecttheNSelectlayerfromtheLayer’sPalette.DrawarectanglewhichsurroundstheActiveareaandextendsby2lambdabeyondtheActiveareaborders.3.PolySelectthePolylayerfr

6、omtheLayer’sPalette.Drawarectangleasshownonthefigure:layout_quick_start_ledit_1_1.doc5RunaDRCchecktoverifythatnoerrorsweremade.ThisconcludesthedrawingofthesmallestNMOStransistor.Howdidwechoosethelayoutdimensions?TheMOStransistorchannelisdefinedbytheActiveandPolyoverlap.Theminimumchannelsizei

7、sL=2lambda,W=3lambdabecauseofthefollowingdesignrules:·ActiveMinimumWidth=3lambda·PolyMinimumWidth=2lambdaThesizeoftheDrainandSourceareasisrestrictedby:·Source/DrainWidth=3lambdaThePolyrectangleshouldextendoutofactiveareaaccordingto:layout_quick_sta