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1、pcb电磁兼容分析（PCBelectromagneticcompatibilityanalysis）Thisarticleiscontributedbyweiwang0703DOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.EMCdesignofPCBCrosstalkinprintedcircuitboardincludingelectromagnetici
2、nterferencecouplingofcommonimpedance,radiation,high-frequencycurrentcarryingwiresgenerate,andprintedlinesonhighfrequencyradiationinduction.Highfrequencyradiationoneofthemostseriousproblems,thisisbecausethepowerlineandgroundline,signallineimpedanceincreaseswiththeincreaseoffrequenc
3、y.Easilythroughthecouplingofcommonimpedanceinterference;atthesametime,theincreaseinthefrequencyofcapacitivecircuitparasiticcapacitanceisreduced,thusthecrosstalkismorelikelytohappen;inaddition,withtheincreaseoffrequency,thewiresizecanreachandtheclockandtheharmonicwavelengthlevel.Th
4、erefore,thehighfrequencyradiationanothermoreobvious.Ahighfrequencydigitalcircuitdesignistheresultofreflectionandtransmissionlinesignaldistortioncausedbyanimpedancemismatch.Commonimpedancecouplingproblemcommonimpedancecouplingproblemof1.PCBinthesimulationwhenMixedcircuitsanddigital
5、circuitsonthesameprintedcircuitboard,ifthepowerandgroundsharing,mayhaveseriousproblems.Thecouplingofcommonimpedanceinterferencevoltagegeneratedinthewireloop,whichmaybehigherthanthereceivedanaloganddigitalcircuitsinthepublicintheloopnoisevoicelimit,causingequipmentcannotworkgoodsta
6、bility.Theprintedcircuitboardwiringschemeismade,analoganddigitalcircuitswithpowerandgroundpaththemselves,sothattheinterferencevoltagewillnotappearintheinputendoftheamplifier.Inaddition,wherepossible,shouldtrytowidenthepowerandgroundthetwopartsofthecircuit,inordertoreducethepowersu
7、pplyandimpedancewireloop,reducinganypossibleinthepowersupplyandgroundloopinterferencevoltage.AseparateanaloganddigitalPCBcanworkinthevicinityofthegroundingsystemofsinglejunction,suchaspowersupplyLinevoltage,analoganddigitalcircuitinthepowersupplyentrancesinglejunction,suchasthepow
8、ersupplyvoltageisnotthesame,intwo
