Kuchera Kwakadzika Kwakadzorwa Mukugadzira PCB: Kuchera Kwemusana Chii chinonzi kuchera kwemusana muPCB?
Kuboorera kumashure mumabhodhi emagetsi akadhindwa ane layer yakawanda inzira yekubvisa stub kuti igadzire ma vias, zvichibvumira masaini kufamba kubva pane rimwe bhodhi kuenda kune rinotevera. (Ma stubs achagadzira kuratidzwa, kupararira, kunonoka, nezvimwe zvinetso panguva yekutumirwa kwechiratidzo, izvo zvichaita kuti chiratidzo chikanganiswe.) Kuboorera pakadzika kwakadzorwa kunoda hunyanzvi hwakaoma. Kugadzira mabhodhi edunhu ane layer yakawanda, akadai semabhodhi ane layer gumi nemaviri, kunoda kubatanidza layer yekutanga kune layer yechipfumbamwe. Kazhinji, tinoboorera mumakomba kamwe chete tisati taisa through vias. Pasi rekutanga nepasi rechigumi nemaviri saka zvakabatana ipapo ipapo. Muchokwadi, pasi rekutanga rinongoda kubatanidzwa kune pasi rechipfumbamwe. Sezvo pasina waya dzinobatanidza nhanho yegumi kusvika yechigumi nembiri, dzakafanana nembiru. Iyi koramu ine simba panzira yechiratidzo uye inogona kukanganisa kusimba kwechiratidzo chekutaurirana. Nokudaro, gomba rechipiri rakaboorwa kubva kune rimwe divi rekoramu yekuwedzera (inonzi STUB muindasitiri).
Nekuda kweizvozvo, inozivikanwa se back drilling, zvisinei kazhinji haina kuchena se drilling nekuti danho rinotevera richashandisa electrolyze imwe copper uye muromo wekuboorera wacho wakapinzawo. Saka tichasiya poindi diki kwazvo; kureba kweiyi STUB yasara kunozivikanwa se B value, uye inowanzova pakati pe50 kusvika 150 UM.
Tekinoroji yePCB yekuboorera kumashure
Nekuda kwekudzikisa kurasikirwa kwechiratidzo pakushandiswa kwema frequency akawanda, gomba rinopinda nepakati rinodiwa kuti chiratidzo chifambe nepakati pacho pachinofamba kubva kune chimwe kuenda kune chimwe. Zvinokurudzirwa kubvisa mhangura yakawandisa kubva mugomba iri pakushandisa uku nekuti inoshanda se antenna uye inokanganisa kutumirwa kana chiratidzo chichizoyerera kubva padanho rekutanga kuenda kune rechipiri mubhodhi rine 20 layer, semuenzaniso.
Kuti tiwane kugadzikana kukuru kwechiratidzo, tinoboora mhangura "yakawandisa" mugomba tichishandisa back-drilling (kudzika kwakadzorwa mu z-axis). Mhedzisiro yakanaka ndeyekuti stub (kana "yakawandisa" mhangura) ive pfupi sezvinobvira. Kazhinji, saizi yeback-drill inofanira kunge yakakura ne 0.2mm kupfuura via inoenderana.
Iyomaitiro ekudhonza kumashure anobvisa matandakubva mumaburi akaputirwa nepakati (vias). Matanda haadiwi /zvikamu zvema-via zvisina kushandiswa, iyo inotambanuka kupfuura chikamu chemukati chekupedzisira chakabatana.
Zvidimbu zvinogona kutungamira kukuratidzwa kwechiedza, naizvozvowokukanganiswa kwesimba, inductivity uye impedanceKukanganisa uku kwekusaenderera mberi kunova kwakakosha nekuwedzera kwekukurumidza kwekupararira.
Ndege dzemumashureuye mabhodhi ePrinted Circuit akakora zvikuru, anogona kutsungirirakukanganiswa kwakakosha kwekuvimbika kwechiratidzokuburikidza nematanda. Nekuti MaPCB Akawanda Anowanzoitwa(semuenzaniso neImpedance control), kushandiswa kwebackdrilling, pamwe nekushandiswa kwemapofu uye akavigwa, inogona kuva chikamu chemhinduro.
Backdrill inogona kuiswa pachero rudzi rwebhodhi redunhuuko zvidimbu zvemasaini zvinokonzera kudzikira kwekuvimbika kwechiratidzo, pasina kufunga nezvekugadzirwa uye marongerwo azvo zvakanyanya. Kusiyana neizvi, pakushandisa ma blind vias, chiyero cheaspect chinofanira kurangarirwa.
Zvinhu zvePCB back drilling
Mabhenefiti eKuboorera Musana
● Deredza kukanganiswa kweruzha & kushamisika kwemanzwiro;
● Kuvandudza kuvimbika kwechiratidzo;
● Kuderedzwa kweukobvu hwenzvimbo;
● Deredza kushandiswa kwema-vias akavigwa uye asingaonekwe uye kuderedza kuoma kwekugadzirwa kwePCB;
● Chiyero chidiki chekukanganisa kwebhiti (BER);
● Kuderedza kuderedzwa kwechiratidzo nekuvandudzwa kwekuenzanisa kwe impedance;
● Kukanganisa kushoma kwekugadzirwa uye marongerwo;
● Kuwedzera kwebandwidth yechiteshi;
● Kuwedzera kwehuwandu hwedata;
● kuderera kweEMI/EMC kubva kumagumo estub;
● Kuderedzwa kwekufara kwema resonance modes;
● Kutaudzana kwakaderera kuburikidza ne-to-via;
● Mari shoma pane mari inotorwa ne laminations dzakatevedzana.
Kushata kweKuboorera Musana
Masaini akakwira anowanzova nematambudziko angave akabatana nekusashandiswa zvakanaka kuburikidza nemastubs. Ngatinyatsoongororai mamwe ematambudziko ane mastubs.
Kuzvikudza Kwepfungwa:
Mawachi ese ari maviri anotora nguva, uye huwandu hwechikanganiso chenguva hunonzi jitter. Kudzikisira jitter kunozivikanwa sekuchinja kwenguva kwakajairika (kureva, kwakaganhurirwa).
Kudzikiswa kwechiratidzo:
Kana ruzha rukadzikira, simba raro rinoderera uye kurova kwemoyo kunopera simba.
Kupisa kwemwaranzi kubva kuEMI:
A via stub inogona kushandiswa se antenna, ichiburitsa EMI.
Hunhu hwakawanda
● Kazhinji mabhodhi akaomarara ari kumashure;
● Inowanzo shandiswa pazvikamu zvisere kana kupfuura;
● Ukobvu hwebhodhi hunopfuura 2.5mm;
● Saizi shoma yekubata i0.3mm;
● Backdrill yakakura ne 0.2mm kupfuura ma vias;
● Kushivirira kudzika kwe backdrill+/-0.05MM.
Imhandoi yePCB inoda kucherwa kumashure?
Kazhinji, maburi ebhodhi rePCB anoboorwa nebhodhi (kubva kumusoro kusvika pasi). Kana trace inobatanidza maburi ari pedyo nedenga repamusoro (kana danda repasi), zvichaita kuti pave nekupatsanuka kwegomba rePCB, izvo zvinokanganisa kunaka kwechiratidzo uye zvinokonzera kuratidzwa. Zviratidzo zvinofamba nekukurumidza zvinokanganiswa zvakanyanya nemhedzisiro iyi.
Kuti uwane signal transmission yemhando yepamusoro, zvinonzwisisika kuti circuit track iri paPCB board ine Signals dzayo pa 1Gbps inofanira kufungwa kuti inosanganisira back-drill design. Ehe, kugadzira high-speed connectivity lines kunoda system engineering uye hakusi nyore sezvazvingaita. Kana system connectivity links dzisina kureba zvakanyanya kana kuti chip's drive cap's powerful equip's drive yakasimba zvakakwana, signal quality inogona kunge isina dambudziko pasina back-drilling. Saka, system connectivity link simulation ndiyo nzira chaiyo yekuona kana back-drill ichidiwa kana kwete.
Ungave uchiziva kuti, pamusoro pekushandisa tekinoroji yekuboorera kumashure, nzira dzakasiyana dzekuvaka dzinogona kushandiswawo kuderedza kana kugadzirisa hurefu hwestub. Izvi zvinosanganisira marongero akasiyana-siyana ekurongedza, uko marongero ecircuit track anochinjirwa kune layers ari pedyo nemagumo estub, maburi akaboorwa nelaser (microvias), kana ma blind and built vias. Pamusoro pezvo, sezvo dzimwe nzira dzichishandiswa kuderedza kuratidzwa kwesignali pamabhodhi ane frequency yakakwira (yakakwirira kupfuura 3GHz), kuchera kumashure hakudiwi.
Zvisinei, nzira idzi hadzisi nguva dzose dzinoshanda kubva pakugadzira uye dzinodhura zvishoma kuderedza kurasikirwa kwechiratidzo mumaPCB akawanda ane density yakakura kana backplanes/mid-planes. Saka, sarudzo chete inoshanda ndeyekuboorera back via stub. Kana maburi eblind vias asiri sarudzo, kuboorera back kunova kwakakosha kune mabhodhi ane frequency yakakwira (anopfuura 1GHz mukati me3GHz).
Uye sezvo PCB ine maburi akawanda kudaro, mamwe maburi haagone kugadzirwa semaburi asingaonekwe (semuenzaniso, paPCB ine maburi gumi nematanhatu, mamwe kuburikidza nemaburi anofanira kubatana nezvikamu 1 kusvika 10 uye rimwe kuburikidza negomba rinofanira kubatana nezvikamu 7 kusvika 16; dhizaini iyi haina kukodzera maburi asingaonekwe asi yakakodzera kubhoorwa kumashure).
Maitiro ekuboorera PCB kumashure?
Maitiro Ekuchera Musana
1. Kuti uwane gomba rekutanga rekuboorera, shandisa gomba rekuisa paPCB rakapihwa.
2. Usati waisa jira, shandisa membrane yakaoma kuvhara gomba renzvimbo.
3. Fura gomba nemhangura kuti ugadzire denderedzwa rinotungamira.
4. Gadzira mufananidzo wekunze paPCB.
5. Mushure mekugadzira pateni yekunze, bhodhi remifananidzo richaiswa paPCB. Izvi zvisati zvaitika, zvakakosha kuvhara gomba rekuisa ne membrane yakaoma usati watanga izvi.
6. Shandisa maburi ekutanga ekuboorera kuti urongedze gomba rekumashure, wobva washandisa bhora rekuboorera kuboorera maburi ane electroplated anoda maitiro aya.
7. Mushure mekuboorwa kwekupedzisira, bhodhi rinofanira kucheneswa kuitira kubvisa chero zviboorwa zvingangosara.
8. Mushure mekunge bhodhi rasimbiswa uye kuvimbika kwechiratidzo kwavandudzwa, nyatso cherechedza kana basa rekuboorera riri kuitwa nemazvo.
Edza Kudzidzira Kwemashure
Kana nzira yekudhonza yapera, tinofanira kuva nechokwadi chekuti mabhora ekumashure agadziriswa nemazvo. Kuti usimbise izvi, vhura machira ese. Uchaona kuti rim yemabhazi ine mavara maviri pairi. Chikamu chekutanga kana chekutanga chinoratidzwa mutsvuku, nepo chikamu chekupedzisira chinoratidzwa mubhuruu. Zviri nyore kusiyanisa mabhora ekumashure nemamwe mabhazi. Mabhora ekumashure chete ndiwo anoonekwa nemavara maviri.
Dzvanya Drill Table mushure mekusarudza nzvimbo kubva pamenyu huru kuti uone kuti mangani maVias, PTH, uye mamwe matroll akaitwa.
Matambudziko ehunyanzvi ekugadzira bhora rekumashure.
1.Kudzora kudzika kwekuchera kumashure
Kuti zvinyatsogadziriswa ma blind vias, kudzora kudzika kwe drilling back kwakakosha. Kushivirira kudzika kwe drilling back kunonyanya kukanganiswa nekunyatsojeka kwemidziyo yekuboora kumashure uye kushivirira kwepakati nepakati. Kunyatsojeka kwe drilling back, zvisinei, kunogonawo kukanganiswa nezvinhu zvekunze zvakaita se resistance ye drill, drill tip angle, contact effect pakati pe cover board ne measurement device, uye board warpage. Kuti uwane mhedzisiro yakanaka uye utarise kururama kwe drilling back, zvakakosha kusarudza zvinhu nematekiniki akakodzera ekuboora kumashure panguva yekugadzira. Vagadziri vanogona kuvimbisa kutapurirana kwechiratidzo chemhando yepamusoro uye kudzivirira matambudziko ekuvimbika kwechiratidzo nekutarisa zvakadzama kudzika kwe drilling back.
2.Kutarisa kuchera kwakarurama kwemashure
Kudzora kucherwa kwemusana kwakarurama kwakakosha pakudzora kunaka kwePCB mumabasa anotevera. Kucherwa kwemusana kunosanganisira kucherwa kwechipiri zvichibva padhayamita yegomba rekutanga, uye kunyatsocherwa kwechipiri kwakakosha. Kunyatsojeka kwechiitiko chechipiri chekuchera kunogona kuchinjwa nezvinhu zvakasiyana-siyana, zvakaita sekuwedzera nekudzika kwebhodhi, kururama kwemuchina, uye matekiniki ekucherwa. Zvakakosha kuve nechokwadi chekuti maitiro ekucherwa kwemusana anotungamirirwa nemazvo kuitira kuderedza zvikanganiso uye kuchengetedza kutumirwa kwechiratidzo uye kuvimbika kwakakodzera.
Danho rakakosha uye rakaoma nderekubhowa nekuti kunyangwe kukanganisa kudiki kunogona kukonzera kukuvara kukuru. Usati waisa odha, unofanirwa kufunga nezvehunyanzvi hwemugadziri wePCB. Richfulljoy inopa mabhodhi akaboorwa pamutengo unodhura uye inonyanya kugadzira maPCB prototype. Mabhenefiti edu anosanganisira nguva yekutumira nekukurumidza uye kuvimbika kwakanyanya. Richfulljoy, mugadziri wePCB anozivikanwa muChina, ane ruzivo rwese nehunyanzvi hunodiwa kuti akubatsire. Kana uine chero mazano ePCB assembly kana prototype, ndapota taura nesu: mkt-2@rich-pcb.com
