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1、印制电路板设计原则和抗干扰措施4（Printedcircuitboarddesignprincipleandtheantiinterferencemeasures4）Electronicengineerwas(8):printedcircuitboarddesignprincipleandtheantiinterferencemeasures4Accordingtoourexperience,totalkaboutthefollowingaspects:inmyopinion,acleardesig
2、ngoal:toreceiveadesigntask,wemustfirstclearthegoalofthedesign,PCBboard,PCBboard,ordinaryhighfrequencysmallsignalprocessingPCBboardorbothhighfrequencyandsmallsignalprocessinginPCBifthePCBisingeneral,aslongasthelayoutreasonableandtidy,mechanicalsizeaccur
3、acycanbe,asintheloadlineandthelinewillusesomemethodsforprocessing,reducingtheload,tostrengthenthelong-termdrive,thefocusistopreventlong-termreflection.Whentheboardhasmorethan40MHzofthesignalline,itisnecessarytothesesignallinesforspecialconsiderations,s
4、uchasinterlinecrosstalkandotherissues.Ifthefrequencyishigher,morestringentrestrictionsonthewiringlength,accordingtothedistributionparametersofthenetworktheory,theinteractionbetweenthehighspeedcircuitanditsconnectionisadecisivefactor,cannotbeignoredinth
5、edesignofsystem.Withthetransferspeedofthedoor,inthesignallineoftheoppositionwillincrease,thecrosstalkbetweentheadjacentsignallineswillbeproportionaltotheincreaseinpowerconsumptionandheatdissipationareusuallyhighspeedcircuitisalsoverybig,inthehigh-speed
6、PCBshouldarouseenoughattention.Whenthereisaweaksignalmvlevelevenmicrovoltboard,thesignallinewillneedspecialcare,becauseofthesmallsignalistooweak,veryeasytobeinterferedbyotherstrongsignalshieldingmeasures,itisoftennecessary,otherwiseitwillgreatlyreducet
7、hesignal-to-noiseratio.Sothattheusefulsignalissubmergedbynoiseandcannotbeextractedeffectively.Onboardtestshouldalsobeconsideredinthedesignphase,thephysicallocationofthetestandtheisolationoffactorssuchasthetestpointcannotbeignored,becausesomesmallsignal
8、andhighfrequencysignalisnotaddeddirectlytotheprobemeasurement.Inaddition,someotherrelatedfactors,suchasthenumberofboards,thepackageshapeofthecomponentsandthemechanicalstrengthoftheboard,shouldbeconsidered.BeforemakingaPCBboard,makesurey
