Yintoni i-PCB ye-High-Frequency

Ii-PCBs ze-high-frequency ngokubanzi zibonelela ngoluhlu lwamaza ka-500MHz ukuya kwi-2 GHz, ezinokuhlangabezana neemfuno zokuyilwa kwe-PCB enesantya esiphezulu, i-microwave, i-radiofrequency kunye nezicelo eziphathwayo. Xa i-frequency iphezulu kune-1 GHz, sinokuyichaza njengefrikhwensi ephezulu.

Namhlanje, ukuntsonkotha kwamacandelo e-elektroniki kunye nokutshintsha kuyaqhubeka ukwanda, kwaye ukuhamba komqondiso okukhawulezayo kuyafuneka kunesiqhelo. Ke ngoko, i-frequency ephezulu yosulelo iyafuneka. Xa udibanisa iimfuno zomqondiso ezizodwa kumacandelo elektroniki kunye neemveliso, high-frequency PCB ineengenelo ezininzi, ezifana ukusebenza kakuhle, isantya fast, attenuation eliphantsi, kunye rhoqo dielectric constant.

High-frequency PCB - izinto ezikhethekileyo

Iimathiriyeli ezikhethekileyo ziyafuneka ukuze kuqatshelwe ubungakanani obuphezulu obubonelelwa ngolu hlobo lwebhodi yesekethe eprintiweyo, Kuba naluphi na utshintsho lwemvume yabo lunokuchaphazela ukungasebenzi kweePCB. Abaqulunqi abaninzi bePCB bakhetha imathiriyeli ye-dielectric kaRogers kuba inelahleko yedielectric esezantsi, ilahleko yomqondiso ophantsi, iindleko ezisezantsi zokwenziwa kwesekethe, kwaye ifaneleke ngakumbi ukuguqula ngokukhawuleza usetyenziso lweprototype phakathi kwezinye izinto.

IZakhono zokuBeka ii-PCB eziQhelekileyo

1. Okukhona ukhokelo olusezantsi phakathi kwezikhonkwane zesixhobo sombane esinesantya esiphezulu ezigobileyo kungcono

Intambo ehamba phambili ye-high-frequency circuit wiring ikhethwa ukuba ibe ngumgca opheleleyo, omele uguqulwe, kwaye unokugotywa ngumgca we-45-degree okanye i-arc circular. Le mfuneko isetyenziselwa kuphela ukuphucula amandla okulungisa i-foil yobhedu kwi-low-frequency circuit, kunye ne-high-frequency circuit, umxholo uyanelisekile. Enye imfuneko kukunciphisa usasazo lwangaphandle kunye nokudityaniswa okufanayo kweempawu zefrikhwensi ephezulu.

2. Isixhobo sesekethe esiphakamileyo esiphakathi kweeleyile zephini ngokutshintshana ngaphantsi kangangoko kunokwenzeka

Oko kubizwa ngokuba "ukutshintshana okuncinci phakathi kweeleya zesikhokelo kungcono" kuthetha ukuba okumbalwa ngokusetyenziswa kwinkqubo yoqhagamshelo lwecandelo, kungcono. Ukudlula kunokuzisa amandla okusasazwa malunga ne-0.5pF, kwaye ukunciphisa inani lokudlula kunokunyusa kakhulu isantya kunye nokunciphisa ukuba nokwenzeka kweempazamo zedatha.

3. Ukhokelo phakathi kwezikhonkwane zesixhobo sesekethe ye-high-frequency lufutshane kangangoko kunokwenzeka

Ubunzulu obukhazimlayo bomqondiso bulingana nobude bomkhondo womgca wophawu. Okukhona ukukhokelela kophawu oluphezulu, kokukhona kulula ukutshata necandelo elikufutshane nalo, ngoko ke kwiiwotshi ezinjengemiqondiso, ikristale, idata yeDDR, imigca yophawu oluphezulu olufana nemigca yeLVDS, imigca ye-USB, kunye neentambo zeHDMI. ziyafuneka zibemfutshane kangangoko.

4. Nika ingqalelo kwi-"crosstalk" eqaliswe ngumgca wesignali kunye nomgama omfutshane we-parallel line

Iingxaki eziNtathu ezinkulu zoYilo lwePCB ezikhawulezayo

Xa usebenza kuyilo lwePCB olunesantya esiphezulu, kukho intaphane yemiba oya kudibana nayo endleleni yokufumana imiqondiso yakho inxibelelane ukusuka kwindawo A ukuya kwindawo B. Kodwa kuzo zonke, iinkxalabo ezintathu eziphezulu ekufuneka uziqaphele zezi:

Ixesha. Ngamanye amazwi, ngaba zonke iisignali kuyilo lwePCB yakho zifika ngexesha elifanelekileyo ngokunxulumene nezinye iisignali? Zonke iimpawu zesantya esiphezulu kwibhodi yakho zilawulwa yiwotshi, kwaye ukuba ixesha lakho licinyiwe, uya kuba ufumana idatha eyonakeleyo.

Ingqibelelo. Ngamanye amazwi, ngaba imiqondiso yakho ijongeka ngendlela ebekufanele ngayo xa ifika kwindawo yayo? Ukuba abakwenzi oko, oko kuthetha ukuba umqondiso wakho kusenokwenzeka ukuba udibane nophazamiseko oluthile endleleni olonakalise ingqibelelo yalo.

Ingxolo. Ngamanye amazwi, ngaba imiqondiso yakho idibene nalo naluphi na uhlobo lophazamiseko kuhambo lwabo ukusuka kwisidluliseli ukuya kumamkeli? Yonke i-PCB ikhupha uhlobo oluthile lwengxolo, kodwa xa ingxolo eninzi ikhona, ngoko unyusa ithuba lorhwaphilizo lwedatha.

Ngoku, iindaba ezimnandi zezokuba ezi Ngxaki ziNtathu ziNtathu zinkulu onokuthi udibane nazo kuyilo lwePCB olunesantya esiphezulu zonke zinokulungiswa zezi ziSombululo ziZintathu ziNtathu:

Impedance. Ukuba ne-impedance efanelekileyo phakathi komthumeli wakho kunye nomamkeli kuya kuba nefuthe elithe ngqo kumgangatho kunye nokuthembeka kweempawu zakho. Oku kuya kuchaphazela indlela iimpawu zakho ezibuthathaka ngayo kwingxolo.

Ukuthelekisa. Ukuthelekisa ubude beetrekhi ezimbini ezidityanisiweyo kuya kuqinisekisa ukuba umkhondo wakho ufika ngexesha elinye kwaye ungqamaniswa newotshi yakho. Ukutshatisa sisisombululo esibalulekileyo ukujonga DDR, SATA, PCI Express, HDMI, kunye izicelo USB.

Izithuba. Okukhona ulandelelwano lwakho lusondele omnye komnye, kokukhona luchaphazeleka ngakumbi kwingxolo kunye nezinye iindlela zokuphazamiseka komqondiso. Ngokungabeki umkhondo wakho kufutshane kunokuba kufuneka ube, uya kunciphisa inani lengxolo ebhodini yakho.

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