Kusanthula kwa Ukadaulo wa Kubowola Msana mu Kapangidwe ka PCB Yothamanga Kwambiri

Choyamba, zigawo za ulalo wolumikizirana wothamanga kwambiri ndi:

(1) Kuyika ma chip: Kawirikawiri, m'lifupi mwa ma waya a PCB mkati mwa chikwama choyika ma chip ndi wocheperako kuposa wa PCB wamba, zomwe zimapangitsa kuti kulamulira kwa impedance kukhale kovuta;

(2) PCB kudzera: PCB kudzera nthawi zambiri zimakhala ndi zotsatira zogwira ntchito zokhala ndi impedance yochepa, ndipo ziyenera kukhala zokhazikika komanso zokonzedwa bwino kwambiri pakupanga PCB;

(3) Cholumikizira: Kapangidwe ka cholumikizira cha mkuwa mkati mwa cholumikizira kamakhudzidwa ndi kudalirika kwa makina komanso magwiridwe antchito amagetsi, chifukwa chake kuyenera kufunafuna mgwirizano pakati pa ziwirizi.

PCB via nthawi zambiri imapangidwa ngati mabowo odutsa (kuchokera pamwamba mpaka pansi). Pamene mzere wa PCB wolumikiza via udutsa pafupi ndi pamwamba, kugawanika kwa "stub" kumachitika pa via ya PCB connection link, zomwe zimapangitsa kuti chizindikiro chiziwoneka bwino ndikukhudza mtundu wa chizindikiro. Izi zimakhudza kwambiri zizindikiro pa liwiro lalikulu.

Ukadaulo wobowola kumbuyo umatanthauza kugwiritsa ntchito njira zobowola zozama, pogwiritsa ntchito njira yachiwiri yobowola kubowola makoma a dzenje la Stub la cholumikizira kapena chizindikiro kudzera.

Monga momwe chithunzi chili pansipa chikusonyezera, pambuyo poti dzenje lolowera lapangidwa, chitoliro chowonjezera cha dzenje lolowera la PCB chimachotsedwa pobowola chachiwiri kuchokera "kumbuyo". Zachidziwikire, kukula kwa chitoliro chakumbuyo kuyenera kukhala kwakukulu kuposa kukula kwa dzenje lolowera, ndipo mulingo wololera kuya kwa njira yobowola uyenera kukhazikitsidwa pa mfundo ya "kusawononga kulumikizana pakati pa dzenje la PCB ndi mawaya", kuonetsetsa kuti "utali wa chitoliro chotsalacho ndi wochepa momwe ungathere", womwe umatchedwa "kubowola kolamulira kuya".

Chithunzi chojambula cha gawo la BackDrill lodutsa m'bowo

Zomwe zili pamwambapa ndi chithunzi cha gawo la BackDrill lomwe lili ndi mabowo odutsa. Mbali yakumanzere ndi chizindikiro chachibadwa cha mabowo odutsa, kumanja ndi chithunzi cha chithunzi cha mabowo odutsa pambuyo pa BackDrill, kusonyeza kubowola kuchokera pansi mpaka pansi pa chizindikiro komwe chizindikirocho chili.

Ukadaulo wobowola kumbuyo ukhoza kuchotsa mphamvu ya parasitic capacitance yomwe imabwera chifukwa cha mabowo a khoma, kuonetsetsa kuti mawaya ndi impedance zikugwirizana bwino pa bowo lomwe lili mu ulalo wa njira, kuchepetsa kuwunikira kwa chizindikiro, motero kukonza khalidwe la chizindikiro.

Pakadali pano, Backdrill ndi ukadaulo wotsika mtengo kwambiri womwe ndi wothandiza kwambiri pakukweza magwiridwe antchito a njira zotumizira ma channel. Kugwiritsa ntchito ukadaulo wobowola kumbuyo kudzawonjezera mtengo wopanga ma PCB pamlingo winawake.

Kuboola kumbuyo kumakhala ndi mitundu iwiri: kuboola kumbuyo mbali imodzi ndi kuboola kumbuyo mbali ziwiri.

Kuboola mbali imodzi kungagawidwe m'magulu awiri: kuboola kumbuyo kuchokera pamwamba kapena pansi. Bowo la PIN la pini yolumikizira pulagi likhoza kubooledwa kumbuyo kokha kuchokera mbali yotsutsana ndi nkhope komwe cholumikizira chili. Pamene zolumikizira za chizindikiro cha liwiro lalikulu zayikidwa pamwamba ndi pansi pa PCB, kuboola kumbuyo mbali ziwiri kumafunika.

1) Chepetsani kusokoneza phokoso;

2) Kuwongolera umphumphu wa chizindikiro;

3) Kukhuthala kwa bolodi la m'deralo kumachepa;

4) Chepetsani kugwiritsa ntchito njira yobisika/yosawoneka bwino kuti muchepetse zovuta za kupanga PCB.

Kodi ntchito ya kuboola kumbuyo ndi yotani?

Ntchito ya kuboola kumbuyo ndikuboola zigawo zomwe zili ndi mabowo olowera m'malo omwe alibe kulumikizana kapena ntchito yotumizira kuti apewe kuwunikira, kufalikira, kuchedwa, ndi zina zotero pakutumiza chizindikiro mwachangu.

Njira yobowolera kumbuyo

a. Pali mabowo oikapo zinthu pa PCB, omwe amagwiritsidwa ntchito poikapo zinthu koyamba ndi kuboola mabowo oyamba a PCB;

b. Kuyika PCB pa electroplate mutaboola dzenje koyamba, ndipo filimu youma imatseka dzenje loyikiramo musanayike pa electroplate;

c. Pangani chitsanzo chakunja pa PCB yopangidwa ndi electroplated;

d. Chitani ma electroplating pa PCB mutapanga mawonekedwe akunja a mawonekedwe;

e. Gwiritsani ntchito dzenje loyikapo malo lomwe lagwiritsidwa ntchito ndi wobowola woyamba pobowola kumbuyo, ndipo gwiritsani ntchito tsamba lobowola pobowola kumbuyo;

f. Tsukani dzenje lakumbuyo lobooledwa ndi madzi kuti muchotse zinyalala zilizonse zobooledwa mkati.