PCB设计技巧百问2156819747

PCB(91102)91PCBMechanicalPCBPCBKeepoutlayerTopoverlay&BottomoverlayPCBToppaste&BottompasteTopsolder&BottomsoldertoppastebottompasteDrillguideDrilldrawingMultiplayerPCB92PCBVIAVIARFmaxwellVVtI=I(t)VVtRFRFPCB3DPCB2DRLC93PCB11.5V2.5V1.25V1.2V3.3V1.8V21.5V1.25V+1.8V2.5V+1.2V3.3V2EMI94Z=squaL/C,CZCZ95protel99se89C51,12MHZ40KHZ800hzPCB?89C51,89C51?,?PCBPCB96?ICIBISIBISVIVTbufferSPICEIC97902000mentorWGEN(,“”“”)98PCB2099Vtt100PCB101DDRmemory150Mhz?150Mhz102PCBPCB11.4mil1mil1A15:59||(0)|(0)|!1pPIQx5gqYryA5GHoSPR9bdA!142.entryPCB(7190)70DSPPLDESDESDESDESDESD71PCBABC-DScSL72EESOFTPCB73EMCPCBEMC7441234PCBEMC7545FLASH,SDRAM,...PCBstubbufferflashsdramdspsdramflashflashHyperlynxDDR——DSP——FLASHDDR——FLASH——DSP150MHzDSPFLASHDSPDDR7630MPCBPCBPCBPCB77PCBEMCEMCESD78/EMI7980PCB81PCBPCB824,VCCGNDtopbottomBOTTOMSIDETOPSIDEVIAPOWEREDARLC83“”PCBPCBMentorICX84PCBPCBEDA85PCB86V=L*di/dt://www.eetchina.com/ART_8800305640_617681,617683.HTM.b8400e4b87PROTELICPCBICICSPEC.vccgndfloatprintbondingdrawing88PROTELPCB,89PCBPCB“”“”PCB12390powerPCB41:noplane+component(toproute)2:camplanesplit/mixed(GND)3:camplanesplit/mixed(power)4:noplane+component(noplane+route):camplane,,split/mixed,,(,,EMI)(3.3V,5V)2assign,15:43||(0)|(0)|!1pPIQx5gqYryA5GHoSPR9bdA!141.entryPCB(5170)512FBFBEMC52FCCEMCFCC:federalcommunicationcommissionEMC:electromegneticcompatibilityFCCEMC5354PCB(SI)icx,signalvision,hyperlynx,XTK,speectraquestHspice55PCBLAYOUT5650M100MTTL,GTL,LVTTL57PCBPCBFR4QPCB58PCBmentorMentorRFRFEESOFTRFLAYOUTEESOFTPCBMentorMentoreesoft59mentorMentorGraphicsPCBWG(veribest)Enterprise(boardstation),5v()63PCBPCBPCBxICTPCBICTX64“”65esdESDESDESD66pcbPCB67pcbPCB68pcbPCB69LCDESDICE-1000-4-2CONTACT1100VAIR6000VESD3000V4000VCPU33MHZESDESDLCDPCBLCD70DSPPLDESDESDESDESDESD15:41||(0)|(0)|!1pPIQx5gqYryA5GHoSPR9bdA!140.entryPCB(3150)30PCBEMCEMIEMI/EMC(radiated)(conducted).(30MHz)(30MHz)..EMI/EMC,PCB,,,,,.,,(slewrate),(decoupling/bypass).,(loopimpedance)..,PCB(chassisground)31EDApcb1.3.4PADSCadencePLDPLD32EDAINNOVEDAPADS70%CadenceMentor33PCBTopoverlay----topsilkscreentopcomponentlegend,R1C5,IC10.bottomoverlay----multilayer-----4freepadorvia,multilaypad4toplayer,pad342GPCB,,2GPCBlayout)routing)EDAMentorboardstationRFagilenteesoftMentor352GPCB?36PCB80MHz37LVDS3827M,SDRAM80M-90MVHF50%39Topology,routingorder.4041EMIEMIPCBEMI42EMC.PGNDPCBPCB43dsppldDSP44protelPROTELMENTORWG2000,EN2000powerpcbCadenceallegrozukencadstar,cr500045“”,returncurrentPCBDr.JohsonSI46SIIBIS3.2EBDSPICEHYPERLYNXIS_multiboard47terminal,AC48BUFFER49MentorICXHighSpeedDigitaldesignahandbookofblackmagicterminal50IBISIBISSPICE15:36||(0)|(0)|!1pPIQx5gqYryA5GHoSPR9bdA!139.entryPCB(2130)21DEBUG(non-monotonic)reset(cycle)busprotocoldebug22PCB100MHzPCB?PCB(crosstalkinterference)(timing)(signalintegrity)1.2.3.4.5.(blind/buriedvia)PCB23LCLCRCLCRC(reactance)RCRC24LC(ripplenoise)ESR/ESLLC(switchingregulationpower)LC(pole/zero)(negativefeedbackcontrol)25EMCPCBEMCferritebeadchokeEMCPCB1(slewrate)23(returncurrentpath)45chassisground6groundguard/shunttracesguard/shunttraces720HH26PCB///27//PCB/(returncurrentpath)28PCBPCB(microstrip)(stripline/doublestripline)()PCBterminators()29IBISIBISIBISI/ObufferSPICE()SPICESPICEIBISAIBIS30PCBEMCEMIEMI/EMC(radiated)(conducted).(30MHz)(30MHz)..EMI/EMC,PCB,,,,,.,,(slewrate),(decoupling/bypass).,(loopimpedance)..,PCB(chassisground)15:29||(0)|(0)|!1pPIQx5gqYryA5GHoSPR9bdA!138.entryPCB(120)1PCBPCBPCB(GHz)FR-4GHz(dielectricloss)(dielectricconstant)2(Crosstalk)groundguard/shunttraces3(outputimpedance)(topology)(termination)4()(side-by-side)(over-under)side-by-side56,7(differentialimpedance),,,(signalintegrity)(timingdelay)81.,/(moat),(returningcurrentpath)2.,,loopgainphase,,groundguardtraces,,3.EMIEMIferritebead,,PCBEMI,ferritebead,9EDA,(serpentine),,,,,,,10testcoupontestcouponTDR(TimeDomainReflectometer)PCBtestcoupon()(groundlead)TDR(probe)(probetip)testcoupon1.://www.Polarinstruments.com/index.html(Applicationnotes)11PCBdualstripline12:---1314((viaorDIPpin))(edgerate)()15PCBPCBABA(Kirchoffcurrentlaw)()16PCBPCBGHz40PC(Server)400MHz(Rambus)(blind/buriedvias)mircroviasbuild-up1.HowardW.Johnson“High-SpeedDigitalDesign–AHandbookofBlackMagic”2.StephenH.Hall“High-SpeedDigitalSystemDesign”3.BrianYang“DigitalSignalIntegrity”4.DooglasBrook“IntegrityIssuesandprintedCircuitBoardDesign”17a.(microstrip)Z={87/[sqrt(Er+1.41)]}ln[5.98H/(0.8W+T)]WTHErPCB(dielectricconstant)0.1(W/H)2.01(Er)15b.(stripline)Z=[60/sqrt(Er)]ln{4H/[0.67π(T+0.8W)]}HW/H0.35T/H0.2518(coupling)fluxcancellation(noiseimmunity)19PCB(F