Kodi mukumvetsa malamulo awiri a PCB laminated design?

Kawirikawiri, pali malamulo awiri akuluakulu a mapangidwe a laminated:

1. Chigawo chilichonse cha mayendedwe chiyenera kukhala ndi gawo loyandikana nalo (magetsi kapena mapangidwe);

2.The moyandikana waukulu wosanjikiza mphamvu ndi nthaka ayenera kusungidwa pa mtunda osachepera kupereka lalikulu coupling capacitance;

Chotsatirachi ndi chitsanzo cha magulu awiri mpaka asanu ndi atatu:
A.single-mbali PCB bolodi ndi iwiri mbali PCB bolodi laminated
Kwa zigawo ziwiri, chifukwa chiwerengero cha zigawo ndizochepa, palibe vuto lamination.Kuwongolera kwa radiation kwa EMI kumaganiziridwa makamaka kuchokera ku mawaya ndi masanjidwe;

Kugwirizana kwa ma electromagnetic kwa mbale imodzi - yosanjikiza ndi iwiri - ikukula kwambiri.Chifukwa chachikulu cha chodabwitsa ichi ndi chakuti malo ozungulira chizindikiro ndi aakulu kwambiri, omwe samangotulutsa ma radiation amphamvu a electromagnetic, komanso amachititsa kuti dera likhale lokhudzidwa ndi kusokoneza kwakunja.Njira yosavuta yosinthira kuyenderana kwa ma elekitiromu pamzere ndikuchepetsa malo ozungulira a chizindikiro chovuta.

Chizindikiro chovuta kwambiri: Potengera momwe ma electromagnetic akuyendera, chizindikiro chofunikira kwambiri chimatanthawuza chizindikiro chomwe chimatulutsa cheza champhamvu komanso chokhudzidwa ndi dziko lakunja.Zizindikiro zomwe zimatha kutulutsa ma radiation amphamvu nthawi zambiri zimakhala zanthawi ndi nthawi, monga mawotchi otsika kapena maadilesi.Zizindikiro za kusokoneza ndizomwe zimakhala ndi zizindikiro zochepa za analogi.

Ma mbale osanjikiza amodzi kapena awiri nthawi zambiri amagwiritsidwa ntchito poyerekezera ndi mafupipafupi ochepera 10KHz:

1) Yendetsani zingwe zamagetsi pamtunda womwewo mozungulira, ndikuchepetsa kuchuluka kwa utali wa mizereyo;

2) Poyenda magetsi ndi waya pansi, pafupi wina ndi mzake;Ikani waya pansi pafupi ndi makiyi mawaya pafupi momwe mungathere.Choncho, malo ang'onoang'ono ozungulira amapangidwa ndipo kukhudzidwa kwa ma radiation osiyanitsa kusokoneza kunja kumachepetsedwa.Pamene waya wapansi akuwonjezeredwa pafupi ndi waya wa chizindikiro, dera lomwe lili ndi dera laling'ono kwambiri limapangidwa, ndipo mphamvu yamagetsi iyenera kuyendetsedwa kudutsa dera lino osati njira ina yapansi.

3) Ngati ndi bolodi lozungulira la zigawo ziwiri, likhoza kukhala kumbali ina ya bolodi la dera, pafupi ndi mzere wa chizindikiro pansipa, pamodzi ndi nsalu yotchinga chingwe pansi, mzere wochuluka momwe mungathere.Chifukwa dera dera ndi wofanana makulidwe a bolodi dera kuchulukitsidwa ndi kutalika kwa mzere chizindikiro.

B. Lamination of four layers

1. Sig-gnd (PWR)-PWR (GND)-SIG;

2. GND-SIG(PWR)-SIG(PWR)-GND;

Pamapangidwe onsewa a laminated, vuto lomwe lingakhalepo ndi makulidwe a mbale a 1.6mm (62mil).Kutalikirana kwamagulu kudzakhala kwakukulu, osati kothandiza kuwongolera kulepheretsa, kulumikizana kwapakati ndi kutchingira;Makamaka, katayanitsidwe lalikulu pakati pa strata magetsi amachepetsa capacitance mbale ndipo si kothandiza kusefa phokoso.

Pachiwembu choyamba, nthawi zambiri amagwiritsidwa ntchito ngati tchipisi tambiri pa bolodi.Chiwembu ichi chikhoza kupeza bwino ntchito ya SI, koma EMI ntchito si yabwino kwambiri, yomwe imayang'aniridwa ndi waya ndi zina.Chisamaliro chachikulu: Mapangidwe amayikidwa mu chizindikiro chosanjikiza cha chizindikiro chowundana kwambiri, chothandizira kuyamwa ndi kupondereza ma radiation;Onjezani malo a mbale kuti awonetse lamulo la 20H.

Pachiwembu chachiwiri, nthawi zambiri amagwiritsidwa ntchito pamene chipwirikiti cha chip pa bolodi chimakhala chochepa kwambiri ndipo pali malo okwanira kuzungulira chip kuti aike mphamvu yofunikira yamkuwa.Pachiwembu ichi, gawo lakunja la PCB ndi stratum, ndipo zigawo ziwiri zapakati ndi chizindikiro / mphamvu.Mphamvu yamagetsi pamtundu wamakina imayendetsedwa ndi mzere waukulu, womwe ungapangitse njira yolepheretsa mphamvu yamagetsi kuti ikhale yotsika, ndipo kulepheretsa kwa njira ya microstrip kumakhala kochepa, komanso kungathenso kutetezera ma radiation amkati kudzera kunja. wosanjikiza.Kuchokera pakuwona kwa EMI, iyi ndiye mawonekedwe abwino kwambiri a 4-wosanjikiza PCB omwe alipo.

Chisamaliro chachikulu: zigawo ziwiri zapakati za chizindikiro, mphamvu zosakanikirana zosanjikiza katayanidwe ziyenera kutsegulidwa, mayendedwe a mzere ndi ofukula, pewani crosstalk;Malo oyenerera olamulira, owonetsera malamulo a 20H;Ngati kutsekedwa kwa mawaya kuyenera kuyendetsedwa, ikani mawaya mosamala kwambiri pansi pa zilumba zamkuwa za magetsi ndi nthaka.Kuphatikiza apo, magetsi kapena kuyala mkuwa ayenera kulumikizidwa momwe angathere kuti awonetsetse kuti DC ndi kulumikizidwa kwafupipafupi.

C. Lamination wa zigawo zisanu ndi chimodzi za mbale

Pakupanga kachulukidwe kapamwamba ka chip komanso mawotchi okwera kwambiri, mapangidwe a board 6-wosanjikiza ayenera kuganiziridwa.Njira ya lamination ikulimbikitsidwa:

1.SIG-GND-SIG-PWR-GND-SIG;

Kwa chiwembu ichi, chiwembu cha lamination chimakwaniritsa kukhulupirika kwa chizindikiro, ndi chizindikiro chosanjikiza moyandikana ndi malo oyambira, gawo lamphamvu lophatikizidwa ndi gawo loyambira, kutsekeka kwa gawo lililonse lanjira kumatha kuyendetsedwa bwino, ndipo zigawo zonse ziwiri zimatha kuyamwa maginito bwino. .Kuphatikiza apo, imatha kupereka njira yabwino yobwereranso pagawo lililonse lazizindikiro pansi pamikhalidwe yamagetsi athunthu ndi mapangidwe.

2. GND-SIG-GND-PWR-SIG-GND;

Kwa chiwembu ichi, chiwembuchi chimagwira ntchito pokhapokha ngati kachulukidwe kachipangizo kamakhala kochepa kwambiri.Chigawo ichi chili ndi ubwino wonse wa pamwamba, ndipo ndege yapansi ya pamwamba ndi pansi imakhala yokwanira, yomwe ingagwiritsidwe ntchito ngati chitetezo chabwino.Ndikofunika kuzindikira kuti gawo la mphamvu liyenera kukhala pafupi ndi gawo lomwe silili gawo lalikulu la ndege, chifukwa ndege yapansi idzakhala yokwanira.Chifukwa chake, ntchito ya EMI ndiyabwino kuposa chiwembu choyambirira.

Chidule cha nkhaniyi: Pachiwembu cha bolodi la magawo asanu ndi limodzi, kusiyana pakati pa mphamvu ndi nthaka kuyenera kuchepetsedwa kuti mupeze mphamvu zabwino ndi kugwirizanitsa pansi.Komabe, ngakhale makulidwe a mbale ya 62mil ndi kusiyana pakati pa zigawo kumachepetsedwa, zimakhala zovuta kulamulira kusiyana pakati pa gwero lalikulu la mphamvu ndi nthaka yosanjikiza yaying'ono kwambiri.Poyerekeza ndi ndondomeko yoyamba ndi ndondomeko yachiwiri, mtengo wa ndondomeko yachiwiri ukuwonjezeka kwambiri.Chifukwa chake, nthawi zambiri timasankha njira yoyamba tikayika.Pakupanga, tsatirani malamulo a 20H ndi malamulo osanjikiza magalasi.

D.Lamination wa zigawo eyiti

1, Chifukwa cha kuchepa kwa mayamwidwe amagetsi amagetsi komanso kulepheretsa mphamvu yayikulu, iyi si njira yabwino yolumikizira.Mapangidwe ake ndi awa:

1.Signal 1 gawo pamwamba, microstrip wiring wosanjikiza

2.Signal 2 mkati mwa microstrip routing wosanjikiza, wabwino routing wosanjikiza (X malangizo)

3.Pansi

4.Signal 3 Strip line routing layer, njira yabwino yolowera (Y direction)

5.Signal 4 Cable routing wosanjikiza

6.Mphamvu

7.Signal 5 mkati mwa microstrip wiring wosanjikiza

8.Signal 6 Microstrip wiring wosanjikiza

2. Ndi mtundu wachitatu stacking akafuna.Chifukwa cha kuwonjezera kwa wosanjikiza, imakhala ndi magwiridwe antchito abwino a EMI, ndipo mawonekedwe amtundu uliwonse wa chizindikiro amatha kuwongoleredwa bwino.

1.Signal 1 gawo pamwamba, microstrip wiring wosanjikiza, wabwino waya wosanjikiza
2.Ground stratum, mphamvu yabwino yoyamwitsa mafunde amagetsi
3.Signal 2 Cable routing wosanjikiza.Njira yabwino yopangira chingwe
4.Mphamvu wosanjikiza, ndipo strata zotsatirazi zimapanga mayamwidwe abwino kwambiri a electromagnetic 5.Ground stratum
6.Signal 3 Cable routing wosanjikiza.Njira yabwino yopangira chingwe
7.Kupanga mphamvu, ndi mphamvu yayikulu yolepheretsa
8.Signal 4 Microstrip chingwe wosanjikiza.Chingwe chabwino chosanjikiza

3, Njira yabwino kwambiri yojambulira, chifukwa kugwiritsa ntchito ndege zamitundu ingapo kumakhala ndi mphamvu yabwino kwambiri yoyamwitsa ya geomagnetic.

1.Signal 1 gawo pamwamba, microstrip wiring wosanjikiza, wabwino waya wosanjikiza
2.Ground stratum, mphamvu yabwino yoyamwitsa mafunde amagetsi
3.Signal 2 Cable routing wosanjikiza.Njira yabwino yopangira chingwe
4.Mphamvu wosanjikiza, ndipo strata zotsatirazi zimapanga mayamwidwe abwino kwambiri a electromagnetic 5.Ground stratum
6.Signal 3 Cable routing wosanjikiza.Njira yabwino yopangira chingwe
7.Ground stratum, bwino mayamwidwe a electromagnetic wave mayamwidwe
8.Signal 4 Microstrip chingwe wosanjikiza.Chingwe chabwino chosanjikiza

Kusankhidwa kwa magawo angati oti mugwiritse ntchito komanso momwe mungagwiritsire ntchito zigawozo kumadalira kuchuluka kwa ma network a siginecha pa bolodi, kachulukidwe ka chipangizo, kachulukidwe ka PIN, ma frequency azizindikiro, kukula kwa bolodi ndi zina zambiri.Tiyenera kuganizira mfundo zimenezi.Kuchulukirachulukira kwa ma netiweki azizindikiro, kuchuluka kwa kachulukidwe kachipangizocho, kukwezera kachulukidwe ka PIN, kutengera kuchuluka kwa mawonekedwe azizindikiro momwe kungathekere.Pakuchita bwino kwa EMI ndibwino kuwonetsetsa kuti chizindikiro chilichonse chili ndi gawo lake.