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1、单点接地和多点接地详解（Singlepointgroundingandmultipointgrounding）SinglepointearthingmultipointearthingTheproblemtobesolvedinasinglepointisthe"publicgroundimpedancecoupling"andthe"low-frequencyloop"",Moreoftenthannot,itisaimedat"commonmodeinterference"causedbyl
2、ongrunninglinesInlowfrequencycircuits,theoperatingfrequencyofthesignalislessthan1MHz,anditswiringandinductancebetweenthedevicesarelessaffected,andthecirculationcausedbythegroundingcircuithasagreaterimpactoninterference,soitshouldadoptonepointgroundin
3、g.Whenthesignaloperatingfrequencyisgreaterthan10MHz,thegroundimpedancebecomesverylarge.Atthispoint,thegroundimpedanceshouldbereducedasfaraspossible,andthegroundmultipointgroundingshouldbeadopted.Whentheworkingfrequencyisbetween1and10MHz,ifonepointgro
4、undingisadopted,thegroundwirelengthshallnotexceed1/20ofthewavelength,ormultipointgroundingmethodshallbeadopted.Singlepointearthingbetweendigitalandanalogground,multipointconnectionwithindigitalground.GroundwireinterferenceandgroundwiredesignGrounddes
5、ignisaproblemthatpeoplepayattentiontoinEMCdesign,buttheydon'tknowhowtodoit.Afterunderstandingthemechanismoftheinterferencecausedbygroundwire,thereisadefiniteideainthedesignandimplementationofgroundwire.Thisissuebeginswiththeintroductionoftheprinciple
6、ofinterferencecausedbygroundwire,enablingreaderstounderstandthekeyandprinciplesofdesigninggroundwire.1whatistheearthwire?Therearetwokindsofgroundwire:safetyandsignal.Theformeristoensurepersonalsafetyandequipmentsafetyandsetthegroundwire,thelatteristo
7、ensurethatthecircuitworkscorrectlysetthegroundwire.Themainreasonforthecircuitinterferenceisthesignalground,sotheproblemofsignalgroundisonlydiscussedhere.Thegeneraldefinitionofthesignalfieldisthepotentialreferencepointofthecircuit.Moreappropriately,th
8、isdefinitionisahypothesisinourdesignofcircuits.Fromthisdefinitionitisimpossibletoanalyzeandunderstandsomegroundinterferenceproblems.Fromnowon,wewillusethefollowingdefinitionwhenweanalyzeelectromagneticcompatibilityproblems.Thegroundlineisthegroundimp
