Kuchokera ku PCB Dziko, Marichi, 19, 2021

Tikamapanga mapangidwe a PCB, timakumana ndi mavuto osiyanasiyana, monga momwe zimagwirizanitsa, monga malamulo a EMA, emc. Nkhaniyi yalemba ma PC othamanga kwambiri kwa aliyense, ndipo ndikhulupilira kuti zingathandize aliyense.

1. Momwe mungaganizire zofananira mukamapanga scrimatics PCB yothamanga kwambiri?
Mukamapanga mabwalo othamanga kwambiri a PCB, zofananira ndi imodzi mwazinthu zopanga. Mtengo wovutayo umakhala ndi ubale wotheratu ndi njira yowonera, monga kuyenda pamwamba pa ulalo (micROSTRIP)

Ndiye kuti, mtengo wopumulira ukhoza kutsimikizika mutatha kuwumba. Nthawi zambiri, pulogalamu yosinthirayo singatengere zovuta zina chifukwa cha kukhazikika kwa mtundu wozungulira kapena masamu a algorithm omwe amagwiritsidwa ntchito. Pakadali pano, ongoyerekeza (kuchotsa), monga mwa mitereyi yotsutsana, imatha kusungidwa pazithunzi. Sinthani zotsatira za kusakhazikika poyang'ana. Njira yeniyeni yothetsera vutoli ndikuyesa kupewa osakanizana.

2. Pakakhala ntchito zingapo za digito / maAlog mu bolodi la PCB, njira yachilendo ndiyo kulekanitsa digito / analog. Kodi chifukwa chake ndi chiyani?
Chifukwa cholekanitsa digiri ya digito / ilog ndi chifukwa madera a digito apanga phokoso mu mphamvu ndi pansi posintha pakati pa zomwe zingatheke komanso zotsika. Kukula kwa phokoso kumakhudzana ndi liwiro la chizindikirocho komanso kukula kwapano.

Ngati ndege yapansi siyigawidwa ndipo phokoso lopangidwa ndi dera la digito ndi lalikulu ndipo madera a Analog ali pafupi kwambiri, ngakhale zizindikilo za Analog-to -nalog sizisokoneza phokoso lamphamvu. Ndiye kuti, njira yomwe sinagawidwe ndi digito ingagwiritsidwe ntchito pokhapokha dera la madera a Analog lili kutali ndi dera la digito lomwe limapanga phokoso lalikulu.

3.
Nthawi zambiri, EMI / EMC Zakalezo ndi za gawo lokwera kwambiri (> 30mhz) ndi chomaliza ndi gawo lotsika (<30mhz). Chifukwa chake simungangosamala za pafupipafupi komanso kunyalanyaza gawo lotsika.

Mapangidwe abwino a EMI / EMC akuyenera kuganizira momwe zida ziliri, PCB Stack, njira yofunika yolumikizirana, kusankha chipangizo, etc. kumayambiriro kwa mawonekedwe. Ngati palibe dongosolo labwinoko kale, lidzathetsedwa pambuyo pake. Zidzafika kawiri ndi theka la kuyeserera ndikuwonjezera mtengo.

Mwachitsanzo, malo omwe otchi akunja sayenera kukhala pafupi ndi cholumikizira chakunja momwe mungathere. Zizindikiro zothamanga kwambiri ziyenera kupita kumkati mwamkati momwe mungathere. Samalani ndi zomwe zimapangitsa kuti zigwirizane ndi kupitiriza kwa zonena kuti muchepetse. Kupumula kwa chizindikiro cha chizindikirocho kuyenera kukhala kocheperako momwe mungathere kuchepetsa kutalika. Zida zapamwamba, posankha ma carcitor / nsepass cactacitors, samalani ngati njira yake yobwereza imakumana ndi zofunikira pa ndege.

Kuphatikiza apo, samalani ndi njira yobwezera njira yokhazikika yazizindikiro zapamwamba kuti apange malo ocheperako momwe mungathere (ndiye kuti, kupenyerera kotheka) kuti muchepetse ma radiation. Nthaka imatha kugawidwanso kuti ibweretse phokoso lambiri. Pomaliza, sankhani moyenera pa chassis pakati pa PCB ndi nyumba.

4. Mukamapanga matabwa a PCB, kuti muchepetse kusokoneza, kodi waya wake uyenera kupanga mawonekedwe otsekeka?
Mukamapanga mabodi a PCB, malo a loop nthawi zambiri amachepetsedwa kuti achepetse kusokoneza. Mukayika mzere wa nthaka, siziyenera kuyikidwa mu mawonekedwe otsekeka, koma ndibwino kukonza munthanga yamunda, ndipo malo a nthaka ayenera kuchuluka momwe mungathere.

5.
Kuwongolera kwamtunduwu kwaintaneti kumakhala kovuta, chifukwa cha zosagwirizana, zomvera, komanso zizindikiro zamitundu yosiyanasiyana, zikhalidwe zaulalogy ndizosiyana, ndipo ndizovuta kunena kuti ndi zopindulitsa ndi ziti? Ndipo pochita musanayambe kugwiritsidwa ntchito, ndi mwayi uti kuti mugwiritse ntchito ndi wofunikira kwambiri pa akatswiri, zomwe zimafunikira kumvetsetsa za malo odera, mitundu ya siginecha, komanso zovuta zina.

6. Momwe mungathanirane ndi masanjidwewo ndikuwombera kuonetsetsa kukhazikika kwa zizindikiro pamwambapa 100m?
Chinsinsi cha digito-liwiro chizindikiritso chowoneka bwino ndikuchepetsa mphamvu ya kufalikira pa mtundu wa chizindikiro. Chifukwa chake, mapangidwe a zizindikiro zapamwamba kwambiri pamwamba pa 100m amafunikira mayendedwe achinsinsi kuti akhale ofupikirako. M'madera ozungulira digito, zizindikiro zothamanga kwambiri zimafotokozedwa ndi nthawi yochedwetsa.

Kuphatikiza apo, mitundu yosiyanasiyana ya zizindikiro (monga TTL, GTL, LTL, LVTL) ali ndi njira zosiyanasiyana kuti muwonetsetse kuti silingane.