Kudzora Kudzika Kuchera muPCB Manufacturing: Back Drilling chii chiri kumashure kuchera mu pcb?

Kudzokera kumashure mumapuranga akadhindwa akadhindwa akawanda ndiyo maitiro ekubvisa stub kuti ibudise vias, zvichibvumira masaini kuti afambe kubva pane imwe nhanho yebhodhi kuenda kune inotevera. (Stubs ichagadzira kufungisisa, kuparadzira, kunonoka, uye dzimwe nyaya panguva yekufambisa kwechiratidzo, izvo zvichaita kuti chiratidzo chive chakakanganiswa.) Kuchera pakadzika kunodzorwa kunoda unyanzvi hwakaoma. kubatanidza chikamu chekutanga kune chepfumbamwe. Kazhinji, isu tinoboora nemumakomba kamwe chete tisati taisa kuburikidza vias. Imba yekutanga uye yegumi nembiri saka yakabatana nekukurumidza. Muchokwadi, imba yekutanga inongoda kubatanidzwa kune yepfumbamwe pasi. Sezvo pasina waya dzinobatanidza 10th kuburikidza ne12th level, dzakafanana nembiru. Iyi koramu ine mhedzisiro panzira yechiratidzo uye inogona kukanganisa kutendeseka kwechiratidzo chekutaura. Naizvozvo, gomba rechipiri rakabvongodzwa kubva kune yakatarisana nekoramu yekuwedzera (inonzi STUB muindasitiri).

Nekuda kweizvozvo, inozivikanwa sekuchera kumashure, asi kazhinji haina kuchena pane kuchera nekuti danho rinotevera rinoita electrolyze imwe mhangura uye chibooro chinopinza zvakare chakapinza. Naizvozvo tichasiya pfungwa diki kwazvo; kureba kwe STUB yasara iyi inozivikanwa se B value, uye inowanzobva pa50 kusvika pa150 UM.

Kumashure-kuchera PCB tekinoroji

Nekuda kwekuda kudzikisa kurasikirwa kwechiratidzo kune yakakwira frequency application, kuburikidza negomba rinobatanidza maseru inodiwa kuti chiratidzo chiyerere nepainofamba kubva kune imwe ichienda kune imwe. Zvinokurudzirwa kubvisa yakasara mhangura kubva mugomba iri rekushandisa nekuti inoshanda senge antenna uye inokanganisa kutapurirana kana chiratidzo chichiyerera kubva pachikamu chimwe kuenda pachikamu chechipiri mune makumi maviri layer board, semuenzaniso.

Kuti tiwane kugadzikana kukuru kwechiratidzo, tinodhiza "yakawandisa" mhangura mugomba tichishandisa kumashure-kuchera (inodzorwa kudzika muz-axis). Mhedzisiro yakanaka ndeyekuti stub (kana "yakawandisa" mhangura) ive pfupi sezvinobvira. Kazhinji, saizi yekumashure-yekurovera inofanira kunge iri 0.2mm yakakura kupfuura inoenderana kuburikidza.

Thebackdrill process inobvisa stubskubva paplad-through-holes (vias). Mastubs ndiwo asina basa /zvikamu zvisina kushandiswa zvevias, iyo inowedzera kupfuura iyo yekupedzisira yakabatana yemukati layer.
Stubs inogona kutungamirira kunekufungisisa, naizvozvowokukanganisa kwesimba, inductivity uye impedance. Izvi zvikanganiso zve discontinuity zvinova zvakakosha nekuwedzera kukurumidza kuparadzira.
Backplanesuye gobvu Akadhindwa Circuit Boards kunyanya, anogona kutsungirirakukanganisa kukuru kwechiratidzokuburikidza ne stubs. For High Frequency PCBs(semuenzaniso neImpedance control), iko kushandiswa kwekudzokera shure, pamwe nekushandiswa kwemapofu uye akavigwa vias, inogona kuva chikamu chemhinduro.
Backdrill inogona kuiswa kunechero rudzi rwedunhu bhodhiuko stubs inokonzeresa chiratidzo chekudzikira, ine kushoma dhizaini uye magadzirirwo ekufunga. Mukusiyana, kana uchishandisa mapofu vias, chikamu reshiyo inofanira kuchengetwa mupfungwa.

Zvimiro zvePCB back drilling

Zvakanakira Back Drilling

● Deredza kukanganiswa kweruzha & deterministic jitter;

● Kuvandudza kutendeseka kwechiratidzo;

● Kuderedza ukobvu munharaunda;

● Kuderedza kushandiswa kwekuvigwa & mapofu vias uye kuderedza kuoma kwePCB kugadzirwa;

● Lower bit error rate (BER);

● Kuderera kwechiratidzo kuderera nekuvandudzwa kwekufananidza;

● Dhizaini shoma uye maitiro ekugadzirisa;

● Kuwedzera kwechiteshi bandwidth;

● Kuwedzera data rates;

● yakaderera EMI / EMC emissions kubva kumucheto we stub;

● Kuderedza kufara kwe resonance modes;

● Yakaderedzwa kuburikidza ne-ku-via-crosstalk;

● Mari yakaderera pane sequential laminations.

Kukanganisa kweBack Drilling

Masiginecha epamusoro anowanzo aine nyaya dzinogona kunge dzakabatanidzwa nekusashandiswa zvakanyanya kuburikidza ne stubs. Ngatitarisei zvakanyanya kune mashoma ematambudziko ane stubs.

Jitter Deterministic: 
Mawachi ese ari maviri ane nguva, uye huwandu hwekukanganisa kwenguva hunonzi jitter. A deterrent jitter ndiyo inozivikanwa seyenguva dzose (kureva, shoma) shanduko yenguva.

Kuderedzwa kwechiratidzo:
Kana ruzha rwadzikiswa, kusimba kwaro kunodzikira uye tsinga inopera simba.

Radiation kubva kuEMI:

A via stub inogona kushandiswa senge antenna, inopenya EMI.

General maitiro 

● Kazhinji mapuranga akaoma kumusana;

● Kazhinji inoshandiswa pazvikamu zve8 kana pamusoro;

● Bhodhi ukobvu inopfuura 2.5mm;

● Saizi shoma shoma ndeye 0.3mm;

● Backdrill iri 0.2mm yakakura kudarika vias;

● Kushivirira kwekudzika kwebackdrill +/-0.05MM.

Ndeupi rudzi rwePCB inoda kucherwa kumashure?

Kazhinji, maburi ePCB ebhodhi anodonhedzwa kuburikidza nebhodhi (kubva kumusoro kusvika pasi). Kana iyo trace inobatanidza nemaburi iri padhuze nepamusoro pedenga (kana yepasi layer), zvinozoguma ne stub bifurcation paburi rePCB interconnection link, izvo zvinokanganisa kunaka kwechiratidzo uye kukonzera kuratidzwa. Zviratidzo zvinofamba nekumhanya zvinonyanya kukanganiswa neizvi.

Kuti uwane huwandu hwepamusoro hwekutapurirana kwechiratidzo, zvinowanzo nzwisiswa kuti dhizaini yedunhu paPCB board ine maSignals ayo pamwero we1Gbps inoda kutariswa kuti inosanganisira yekumashure-drill dhizaini. Ehe, kugadzira yakakwira-kumhanya mitsara yekubatanidza inoda system engineering uye haina kutwasuka sezvazvingaite. Kana iyo system yekubatanidza malink isiri yakarebesa kana iyo chip's drive kugona yakasimba zvakakwana, iyo chiratidzo chemhando inogona kunge isina mhosva pasina kumashure-kuchera. Naizvozvo, system interconnection link simulation ndiyo yakanyatsojeka nzira yekuona kana back-drill ichidiwa kana kwete.

Unogona kunge uchiziva kuti, pamusoro pekushandisa tekinoroji yekuchera kumashure, nzira dzakasiyana dzekuvaka dzinogona kushandiswa kudzikisa kana kukwidziridza hurefu hwesipu. Izvi zvinosanganisira marongero akasiyana-siyana, uko matutu edunhu anochinjirwa kune akaturikidzana pedyo nekumagumo kwechitubu, maburi elaser-drilled vias (microvias), kana mapofu nekuvigwa. Pamusoro pezvo, sedzimwe nzira dzinoshandiswa kuderedza kuratidzwa kwechiratidzo pane yakakwira frequency (yakakwira kupfuura 3GHz) mabhodhi, kuchera-kumashure hakudiwi.

Nekudaro, idzi nzira hadzisi dzinogara dzichishanda kubva kunzvimbo yekugadzira uye mutengo wekutarisa kudzikisa kurasikirwa kwechiratidzo mune akawanda akakwira-density PCBs kana backplanes / yepakati-ndege. Saka, sarudzo chete inoshanda ndeyekudzosera iyo via stub kunze. Kana mapofu nemakomba asiri sarudzo, kuchera kumashure kunove kwakakosha kune yakakwira frequency (kupfuura 1GHz mukati me3GHz) mabhodhi.

Uye sezvo PCB iine zvidimbu zvakawanda, mamwe maburi haagone kugadzirwa semabofu (somuenzaniso, pa16-layer PCB, mamwe nemaburi anofanirwa kubatana nezvikamu 1 kusvika 10 uye imwe kuburikidza negomba inofanira kubatana nezvikamu 7 kusvika gumi nematanhatu; iyi dhizaini haina kukodzera maburi mapofu asi yakakodzera kuchera kumashure).

Nzira yekuita sei PCB yekuchera kumashure?

Iyo Maitiro Ekuchera Kumashure

1.Kutsvaga gomba rekutanga rekuchera, shandisa buri rekumisikidza paPCB rinopihwa.

2.Usati waputira, shandisa membrane yakaoma kuti usimbise gomba renzvimbo.

3.Powder gomba nemhangura kuti ugadzire mutungamiri wedunhu.

4.Gadzira mufananidzo wekunze paPCB.

5.After kugadzira yekunze layer pattern, graphic board ichaitwa paPCB. Izvi zvisati zvaitika, zvakakosha kuvhara gomba rekuisa ne membrane yakaoma usati watanga maitiro aya.

6.Shandisa maburi ekutanga ekucheresa kuti aenzanise kuchera kumashure, wobva washandisa chibooreso chekuboora maburi ane electroplated anodaidzira maitiro aya.

7.Mushure mekuchera kwekupedzisira, bhodhi rinofanirwa kucheneswa kuitira kubvisa chero zvingangosara zviboore.

8.Mushure mokunge bhodhi yakasimbiswa uye kutendeseka kwechiratidzo kwakagadziridzwa, nyatsoteerera kana basa rekuchera riri kuitwa zvakakodzera.

Edzai Back Drills 

Kana nzira yapera, tinofanira kuva nechokwadi chokuti zvibooreso zveshure zvakamisikidzwa zvakanaka. Kuti usimbise izvi, batidza maseru. Uchaona kuti vias 'rimu ane mavara maviri pairi. Yekutanga kana yekutanga layer inoratidzwa mutsvuku, nepo yekupedzisira inoratidzwa nebhuruu. Zviri nyore kutaurira kumashure-yakacheneswa vias kunze kweimwe vias. Chete kumashure akaboorwa vias anooneka nemavara maviri.

Dzvanya Drill Tafura mushure mekusarudza nzvimbo kubva kumenyu huru kuti uone kuti mangani maVias, PTH, uye mamwe matroll akaitwa.

Matambudziko ehunyanzvi ekuchera kumashure.

1.Back kuchera kudzika kudzora
Kuti zvigadziriswe nemapofu mapofu, kumashure kuchera kudzika kwekudzora kwakakosha. Iyo yekumashure yekuchera kudzika kushivirira kunonyanya kukanganiswa neiyo yekumashure yekuchera midziyo yechokwadi uye yepakati ukobvu kushivirira. Kunyatso dhiraivha kumashure, zvisinei, kunogona zvakare kukanganiswa nekunze kwakasiyana sekuramba kudhiraivha, drill tip angle, kubata maitiro pakati pekuvhara bhodhi uye kuyerwa mudziyo, uye bhodhi warpage. Kuti uwane mibairo mikuru uye kugadzirisa iko kudhirowa kwemashure, zvakakosha kuti usarudze zvinhu zvekuchera nehunyanzvi panguva yekugadzira. Vagadziri vanogona kuvimbisa kufambisa kwemhando yepamusoro uye vadzivise matambudziko echiratidzo nekugadzirisa zvine hungwaru kudzika kwekuchera kumashure.

2.Back drilling accuracy contro
Kunyatso dhiraivha kudzora kwakakosha pakutonga kwemhando yePCB mune dzinotevera maitiro. Kuchera kumashure kunosanganisira kuchera kwechipiri zvichienderana nedhayamita yegomba rekutanga, uye kuchera kwechipiri kwakakosha. Iko kurongeka kwechimwe chechipiri chekuchera kusanganeka kunogona kukanganiswa nehuwandu hwezvakasiyana, sekuwedzera kwebhodhi uye kudhonzwa, kunyatsoita muchina, uye nzira dzekuchera. Izvo zvakakosha kuve nechokwadi chekuti nzira yekuchera kumashure inonyatso kudzorwa kuchera kuitira kuderedza zvikanganiso uye kuchengetedza kwakaringana chiratidzo chekufambisa uye kuvimbika.

Nhanho yakakosha uye inonetsa kuchera nekuti kunyangwe kukanganisa kudiki kunogona kukonzera kukuvara kukuru. Usati waisa odha, unofanirwa kufunga nezvehunyanzvi hwemugadziri wePCB.Richfulljoy inopa mabhodhi akacheneswa kumashure nemitengo inokwanisika uye inonyanya kubatanidzwa nePCB prototype. Zvatinobatsira zvinosanganisira nguva dzekukurumidza kuendesa uye kuvimbika kwepamusoro.Richfulljoy, anozivikanwa PCB mugadziri muChina, ane ruzivo rwese uye mano anodiwa kuti akubatsire. Kana iwe uine chero mazano ePCB gungano kana prototype, ndapota taura nesu: mkt-2@rich-pcb.com