Ngaba uyayiqonda imithetho emibini yoyilo olulaminethiweyo lwePCB?

Oku kulandelayo ngumzekelo womaleko-mbini ukuya kumaleko asibhozo:

• Ibhodi ye-PCB enecala elinye kunye nebhodi ye-PCB enecala kabini elaminethiweyo

Kwimigangatho emibini, ngenxa yokuba inani leeleya lincinci, akukho ngxaki ye-lamination.Ulawulo lwemitha ye-EMI luqwalaselwa ikakhulu ukusuka kwiingcingo kunye noyilo;

Ukuhambelana kwe-electromagnetic ye-single - layer kunye ne-double - layer plates iya ivelela ngakumbi.Esona sizathu siphambili sale nto kukuba indawo yesiginali yomqondiso inkulu kakhulu, engavelisi kuphela imisebe ye-electromagnetic eyomeleleyo, kodwa yenza ukuba isekethe ichaphazeleke kuphazamiseko lwangaphandle.Eyona ndlela ilula yokuphucula ukuhambelana kwe-electromagnetic yomgca kukunciphisa indawo yelophu yesiginali ebalulekileyo.

Umqondiso obalulekileyo: Ngokwembono yokuhambelana kwe-electromagnetic, uphawu olubalulekileyo lubhekisa ikakhulu kumqondiso ovelisa imitha eyomeleleyo kwaye inovelwano kwihlabathi langaphandle.Imiqondiso enokuvelisa ukusasazeka kwemitha eyomeleleyo idla ngokuba ziimpawu zamaxesha athile, njengemiqondiso ephantsi yeewotshi okanye iidilesi.Ukuphazamiseka kweempawu ezibuthathaka zezo zinemigangatho ephantsi yeempawu ze-analog.

Iipleyiti ezinomaleko omnye kunye neziphindwe kabini zihlala zisetyenziswa kuyilo oluphantsi lokulinganisa olungaphantsi kwe-10KHz:

I-1) Ukuhambisa iintambo zamandla kwinqanaba elifanayo ngendlela ye-radial, kwaye unciphise isamba sobude bemigca;

2) Xa uhamba unikezelo lwamandla kunye nocingo lomhlaba, kufutshane nomnye;Beka ucingo olusezantsi kufutshane nocingo lwesitshixo olusondele kakhulu.Ngaloo ndlela, indawo encinci ye-loop yenziwa kwaye uvakalelo lwe-radiation mode ye-radiation kwi-interference yangaphandle iyancitshiswa.Xa ucingo olusezantsi ludityaniswe ecaleni kocingo lwesignali, isiphaluka esinendawo encinci yenziwa, kwaye umbane wesignali kufuneka uhanjiswe kule sekethi kunomnye umzila womhlaba.

3) Ukuba ibhodi yesekethe ye-double-layer, ingaba kwelinye icala lebhodi yesiphaluka, kufuphi nomgca wesignali ongezantsi, kunye nelaphu lomgca wesignali ucingo lomhlaba, umgca obanzi ngokusemandleni.Ummandla wesiphaluka obangelwayo ulingana nobukhulu bebhodi yesekethe ephindwe ngobude bomgca wesignali.

• B. Ukunyibilika kwemigangatho emine 

1. I-Sig-gnd (PWR)-PWR (GND)-SIG; 

2. GND-SIG(PWR)-SIG(PWR)-GND; 

Kuzo zombini ezi ziyilo zalaminethiweyo, ingxaki enokubakho kubukhulu bepleyiti eyi-1.6mm (62mil).Izithuba zomaleko ziya kuba zikhulu, zingancedi kuphela ukulawula i-impedance, ukudityaniswa kwe-interlayer kunye nokukhusela;Ngokukodwa, isithuba esikhulu phakathi kwestrata sobonelelo lwamandla sinciphisa iplate capacitance kwaye ayincedi ukuhluza ingxolo.

Kwiskimu sokuqala, ngokuqhelekileyo kusetyenziswa kwimeko yenani elikhulu leetshiphusi ebhodini.Esi sikimu sinokufumana ukusebenza okungcono kwe-SI, kodwa ukusebenza kwe-EMI akulunganga kangako, elawulwa ikakhulu ngamacingo kunye nezinye iinkcukacha.Ingqwalasela ephambili: Ukuqulunqwa kufakwe kumgca wesignali weyona ndawo ixineneyo yesignali, ekhuthaza ukufunxa kunye nokunyanzeliswa kwemitha;Yandisa indawo yepleyiti ukuze ubonise umgaqo we-20H.

Kwiskimu sesibini, ngokuqhelekileyo kusetyenziswa apho ubuninzi be-chip ebhodini buphantsi ngokwaneleyo kwaye kukho indawo eyaneleyo ejikeleze i-chip ukubeka amandla afunekayo obhedu.Kwesi sikimu, umaleko wangaphandle we-PCB sistratum, kwaye imigangatho emibini ephakathi isignali/umaleko wamandla.Unikezelo lwamandla kumaleko wesiginali luhanjiswa ngomgca obanzi, onokuthi uthintele indlela yonikezelo lwamandla lwangoku ephantsi, kwaye i-impedance yendlela yomqondiso we-microstrip nayo iphantsi, kwaye inokukhusela ukukhanya kwemitha yangaphakathi ngaphandle. umaleko.Ukusuka kwindawo yolawulo ye-EMI, le yeyona nto ilungileyo ye-4-layer PCB ekhoyo.

Ingqwalasela ephambili: imigangatho emibini ephakathi yesignali, ukudibanisa amandla okudibanisa izithuba kufuneka kuvulwe, isalathiso somgca sithe nkqo, siphephe i-crosstalk;Indawo yephaneli yokulawula efanelekileyo, ebonisa imithetho ye-20H;Ukuba i-impedance yeengcingo kufuneka ilawulwe, ngokucokisekileyo ubeke iingcingo phantsi kweziqithi zobhedu zonikezelo lwamandla kunye nomhlaba.Ukongeza, unikezelo lwamandla okanye ubhedu lokubeka kufuneka ludityaniswe kangangoko kunokwenzeka ukuze kuqinisekiswe iDC kunye noqhagamshelo oluphantsi.

• C. Ukunyibilika kwamanqwanqwa amathandathu amacwecwe

Ukuyila i-chip density ephezulu kunye ne-clock frequency frequency, ukuyila kwebhodi ye-6-layer kufuneka kuthathelwe ingqalelo.Indlela yokuthambisa iyacetyiswa:

1.SIG-GND-SIG-PWR-GND-SIG; 

Kwesi sikimu, iskimu sokunyibilikisa sifezekisa imfezeko yomqondiso olungileyo, kunye nophawu lomqondiso osecaleni komgangatho wokumisa, umaleko wamandla odityaniswe kunye nomgangatho wokumisa, ukunyanzeliswa komgangatho womzila ngamnye kunokulawulwa kakuhle, kwaye zombini iileya zinokufunxa imigca kazibuthe kakuhle. .Ukongeza, inokubonelela ngendlela engcono yokubuya kwinqanaba ngalinye lesiginali phantsi kwemeko yonikezelo lwamandla olupheleleyo kunye nokwakheka.