Kuwunika kwa Back Drilling Technology mu High Speed ​​​​PCB Design

Choyamba, zigawo za ulalo wolumikizana kwambiri ndi:

(1) Chip ma CD: Nthawi zambiri, PCB wiring m'lifupi mkati mwa chip ma CD gawo lapansi ndi yopapatiza kwambiri kuposa ya PCB wamba, zomwe zimapangitsa kuwongolera kwa impedance kukhala kovuta;

(2) PCB kudzera: PCB kudzera nthawi zambiri imakhala ndi zotsatira zowoneka bwino zokhala ndi mawonekedwe otsika, ndipo iyenera kukhala yolunjika komanso yokometsedwa pamapangidwe a PCB;

(3) Cholumikizira: Mapangidwe a ulalo wolumikizira mkuwa mkati mwa cholumikizira amakhudzidwa ndi kudalirika kwamakina komanso magwiridwe antchito amagetsi, chifukwa chake ayenera kufunafuna kukhazikika pakati pa ziwirizi.

PCB kudzera nthawi zambiri imapangidwa ngati mabowo (kuchokera pamwamba mpaka pansi). Pamene chingwe cha PCB cholumikiza kudzera chikayendetsedwa pafupi ndi pamwamba, "stub" bifurcation idzachitika kudzera pa PCB interconnect ulalo, kuchititsa kuwonetsera kwa siginecha ndi kukhudza mtundu wa chizindikiro. Chikokachi chimakhudza kwambiri ma siginecha pa liwiro lapamwamba.

Ukadaulo wakubowola kumbuyo umatanthawuza kugwiritsa ntchito njira zobowola mozama, pogwiritsa ntchito njira yachiwiri kubowola makoma a dzenje la Stub la cholumikizira kapena chizindikiro kudzera.

Monga momwe tawonetsera m'chithunzichi, bowo likapangidwa, Stub yowonjezera ya PCB kupyolera-bowo imachotsedwa ndi kubowola kwachiwiri kuchokera ku "mbali yakumbuyo". Inde, m'mimba mwake wa backdrill bit ayenera kukhala wamkulu kuposa kukula-dzenje kukula, ndi kulolerana kuya mlingo ndondomeko kubowola ayenera zochokera mfundo "osawononga kugwirizana pakati pa dzenje PCB ndi mawaya", kuonetsetsa. kuti "utali wotsala wa stub ndi wocheperako", womwe umatchedwa "kubowola mozama".

Chithunzi chojambula cha through-hole BackDrill gawo

Zomwe zili pamwambapa ndi chithunzi chojambula cha gawo la BackDrill. Mbali ya kumanzere ndi chizindikiro chachilendo kupyolera-bowo, kumanja ndi chithunzi chojambula cha bowo pambuyo pa BackDrill, kusonyeza kubowola kuchokera pansi wosanjikiza mpaka ku chizindikiro chosanjikiza kumene kufufuza kuli.

Ukadaulo wakubowola kumbuyo umatha kuchotsa mphamvu ya parasitic capacitance yomwe imayambitsidwa ndi zibowo za khoma, kuonetsetsa kusasinthasintha pakati pa mawaya ndi kutsekereza pabowo la ulalo wa njira, kuchepetsa kuwunikira kwa siginecha, motero kuwongolera mawonekedwe azizindikiro.

Backdrill pakali pano ndiyo teknoloji yotsika mtengo kwambiri yomwe ndi yothandiza kwambiri popititsa patsogolo kayendedwe ka kanjira. Kugwiritsa ntchito luso pobowola kumbuyo kudzawonjezera mtengo wa kupanga PCB kumlingo wina.

Kubowola kumbuyo kumakhala ndi mitundu iwiri: kubowola kumbuyo kwa mbali imodzi komanso kukumba kumbuyo.

Kubowola kumbali imodzi kumatha kugawidwa m'mbuyo pobowola kuchokera pamwamba kapena pansi. Bowo la PIN la pini yolumikizira pulagi imatha kubwezeredwa kumbuyo kuchokera kumbali yoyang'ana kumaso komwe kulumikizana kuli. Pamene zolumikizira ma siginecha zothamanga kwambiri zimakonzedwa pamwamba ndi pansi pa PCB, kubweza kumbuyo kumafunikira.

1) Kuchepetsa kusokoneza phokoso;

2) Sinthani kukhulupirika kwa chizindikiro;

3) Local bolodi makulidwe amachepetsa;

4) Chepetsani kugwiritsa ntchito kukwiriridwa / akhungu kudzera kuti muchepetse zovuta za kupanga kwa PCB.

Kodi ntchito yobowola msana ndi yotani?

Ntchito yobowola kumbuyo ndikubowola magawo omwe alibe kulumikizana kapena kufalitsa ntchito kuti apewe kuwonetsa, kufalikira, kuchedwa, ndi zina zambiri.

Back pobowola ndondomeko

a. Pali malo mabowo pa PCB, amene ntchito poyambira pobowola udindo ndi woyamba dzenje pobowola wa PCB;

b. Electroplate PCB pambuyo pobowola dzenje loyamba, ndi filimu youma kusindikiza dzenje malo pamaso electroplating;

c. Pangani chitsanzo akunja pa electroplated PCB;

d. Kuchita chitsanzo electroplating pa PCB pambuyo kupanga akunja wosanjikiza chitsanzo;

e. Gwiritsani ntchito dzenje loyikapo lomwe linagwiritsidwa ntchito pobowola koyamba pobowola kumbuyo, ndipo gwiritsani ntchito mpeni wobowola pobowola kumbuyo;

f. Tsukani bowo lobowola kumbuyo ndi madzi kuti muchotse zinyalala zotsalira zotsalira mkati.