Printed Circuit Board Design (PCB) Issues, ADI

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1、PRINTERCIRCUITBOARDISSUESCHAPTER12:PRINTEDCIRCUITBOARD(PCB)DESIGNISSUESINTRODUCTION12.1SECTION12.1:PARTITIONING12.3SECTION12.2:TRACES12.5RESISTANCEOFCONDUCTORS12.5VOLTAGEDROPINSIGNALLEADS—"KELVINFEEDBACK"12.7SIGNALRETURNCURRENTS12.7GROUNDNOISEANDGROUNDLOOPS12.9GROUNDI

2、SOLATIONTECHNIQUES12.11STATICPCBEFFECTS12.15SAMPLEMINIDIPANDSOICOPAMPPCBGUARDLAYOUTS12.17DYNAMICPCBEFFECTS12.19INDUCTANCE12.21STRAYINDUCTANCE12.21MUTUALINDUCTANCE12.22PARASITICEFFECTSININDUCTORS12.24QOR"QUALITYFACTORS"12.25DON'TOVERLOOKANYTHING12.26STRAYCAPACITANCE12.

3、27CAPACITATIVENOISEANDFARADAYSHIELDS12.28BUFFERINGADCsAGAINSTLOGICNOISE12.29HIGHCIRCUITIMPEDANCESARESUSCEPTIBLETONOISEPICKUP12.30SKINEFFECT12.33TRANSMISSIONLINES12.35DESIGNPCBsTHOUGHTFULLY12.36DESIGNNING+B46CONTROLLEDIMPEDANCETRACESONPCBs12.36MICROSTRIPPCBTRANSMISSION

4、LINES12.38SOMEMICROSTRIPGUIDELINES12.39SYMMETRICSTRIPLINEPCBTRANSMISSIONLINES12.40SOMEPROSANDCONSOFEMBEDDINGTRACES12.42DEALINGWITHHIGHSPEEDLOGIC12.43LOWVOLTAGEDIFFERENTIALSIGNALLING(LVDS)12.49REFERENCES12.51BASICLINEARDESIGNSECTION12.3:GROUNDING12.53STARGROUND12.54SEP

5、ARATEANALOGANDDIGITALGROUNDS12.55GROUNDPLANES12.56GROUNDINGANDDECOUPLINGMIXEDSIGNALSICsWITHLOWDIGITALCONTENT12.60TREATTHEADCDIGITALOUTPUTSWITHCARE12.62SAMPLINGCLOCKCONSIDERATIONS12.64THEORIGINSOFTHECONFUSIONABOUTMIXEDSIGNALGROUNDING12.66SUMMARY:GROUNDINGMIXEDSIGNALDEV

6、ICESWITHLOWDIGITALCURRENTSINAMULTICARDSYSTEM12.67SUMMARY:GROUNDINGMIXEDSIGNALDEVICESWITHHIGHDIGITALCURRENTSINAMULTICARDSYSTEM12.68GROUNDINGDSPsWITHINTERNALPHASE-LOCKEDLOOPS12.69GROUNDINGSUMMARY12.70GROUNDINGFORHIGHFREQUENCYOPERATION12.70BECAREFULWITHGROUNDPLANEBREAKS1

7、2.73REFERENCES12.75SECTION12.4:DECOUPLING12.77LOCALHIGHFREQUENCYBYPASS/DECOUPLING12.77RINGING12.80REFERENCES12.82SECTION12.5:THERMALMANAGEMENT12.83THERMALBASICS12.83HEATSINKING12.85DATACONVERTERTHERMALCONSIDERATIONS12.90REFERENCES12.96PRINTERCIRCUITBOARDISSUESINTRODUC

8、TIONCHAPTER12:PRINTEDCIRCUITBOARD(PCB)DESIGNISSUESIntroductionPrintedcircuitboards(PCBs)arebyfarthemostcommonmethodofassembl