CCL (Copper Clad Laminate) ndikutenga malo osungira pa PCB monga gawo lofotokozera, ndikudzaza ndi mkuwa wolimba, womwe umadziwikanso kuti kutsanulira mkuwa.
Kufunika kwa CCL motere:
- kuchepetsa nthaka impedance ndi kupititsa patsogolo anti-kusokoneza luso
- kuchepetsa kutsika kwamagetsi ndikuwonjezera mphamvu zamagetsi
- olumikizidwa pansi ndipo amathanso kuchepetsa dera la lupu.
Monga kugwirizana kofunikira kwa mapangidwe a PCB, mosasamala kanthu za mapulogalamu apangidwe a Qingyue Feng PCB, komanso Protel yachilendo, PowerPCB apereka ntchito yanzeru yamkuwa, momwe mungagwiritsire ntchito mkuwa wabwino, ndikugawana nanu malingaliro anga, ndikuyembekeza kubweretsa. zopindulitsa kumakampani.
Tsopano kuti apange kuwotcherera kwa PCB momwe angathere popanda mapindikidwe, opanga PCB ambiri adzafunikanso wopanga PCB kudzaza malo otseguka a PCB ndi waya wamkuwa kapena gululi ngati pansi. Ngati CCL sinasamalidwe bwino, izi zimabweretsa zotsatira zoyipa. Kodi CCL "yabwino kuposa kuvulaza" kapena "yoyipa kuposa yabwino"?
Pansi pa chikhalidwe cha ma frequency apamwamba, idzagwira ntchito pa makina osindikizira a ma wiring capacitance, pamene kutalika kuli oposa 1/20 ya phokoso laling'ono lofanana ndi mafunde afupipafupi, ndiye amatha kutulutsa mphamvu ya mlongoti, phokoso lidzayamba kupyolera mu waya, ngati pali maziko oipa CCL mu PCB, CCL anakhala chida kufala phokoso, Choncho, mu mkulu pafupipafupi dera, musakhulupirire kuti ngati inu kulumikiza pansi waya pansi kwinakwake, ichi ndi "nthaka", Ndipotu. , iyenera kukhala yocheperapo kusiyana ndi λ/20, phulani dzenje mu cabling ndi multilayer pansi ndege "yokhazikika bwino". Ngati CCL ikugwiridwa bwino, sizingangowonjezera zamakono, komanso zimagwira ntchito ziwiri zotetezera kusokoneza.
Pali njira ziwiri zoyambira za CCL, zomwe ndizovala zazikulu zamkuwa ndi ma mesh mkuwa, omwe nthawi zambiri amafunsidwa, yomwe ili yabwino kwambiri, ndizovuta kunena. Chifukwa chiyani? Dera lalikulu la CCL, ndi kuwonjezeka kwa ntchito zamakono ndi zotetezera zapawiri, koma pali malo akuluakulu a CCL, bolodi likhoza kugwedezeka, ngakhale kuwira ngati kupyolera mwa soldering yoweyula. mkuwa wonyezimira, Ma mesh CCL amateteza makamaka, kukulitsa gawo lapano kumachepetsedwa, Potengera kutentha, gululi ili ndi phindu (imachepetsa kutentha kwa mkuwa) ndipo idachita gawo lina lachitetezo chamagetsi. Koma ziyenera kunenedwa kuti gululi amapangidwa ndi alternating malangizo akuthamanga, tikudziwa kwa mzere m'lifupi kwa pafupipafupi ntchito bwalo dera ali lolingana "magetsi" kutalika (kukula kwenikweni kugawidwa ndi pafupipafupi ntchito ya digito lolingana. pafupipafupi, mabuku konkire), pamene pafupipafupi ntchito si mkulu, mwina udindo wa mizere gululi si zoonekeratu, kamodzi kutalika kwa magetsi ndi ntchito pafupipafupi yofananira, ndi zoipa kwambiri, mudzapeza kuti dera silingagwire ntchito bwino, Chifukwa chake, kwa iwo omwe amagwiritsa ntchito gridi, malangizo anga ndikusankha molingana ndi momwe amagwirira ntchito pamapangidwe a board board, m'malo mogwira chinthu chimodzi. Gululi wamitundu yambiri, mayendedwe otsika pafupipafupi okhala ndi ma frequency apamwamba komanso ena omwe amagwiritsidwa ntchito kwambiri mkuwa wochita kupanga.
Pa CCL, kuti tilole kuti tikwaniritse zomwe tikuyembekezera, ndiye kuti mbali za CCL ziyenera kulabadira mavuto ati:
1. Ngati maziko a PCB ndi zambiri, ndi SGND, AGND, GND, etc., adzakhala malingana ndi udindo wa PCB bolodi nkhope, motero kupanga waukulu "nthaka" monga mfundo kwa CCL palokha, kuti digito ndi analogi kupatutsa mkuwa , pamaso kutulutsa CCL, choyamba, molimba mtima lolingana mphamvu zingwe: 5.0 V, 3.3 V, etc., motere, angapo akalumikidzidwa amapangidwa kwambiri mapindikidwe dongosolo.
2. Pakulumikiza mfundo imodzi ya malo osiyanasiyana, njirayo ndi yolumikizana kudzera mu 0 ohm kukana kapena maginito bead kapena inductance;
3. CCL pafupi ndi kristalo oscillator. The crystal oscillator mu dera ndi mkulu pafupipafupi mpweya gwero. Njirayi ndikuzungulira kristalo oscillator yokhala ndi mkuwa ndikuyika chipolopolo cha crystal oscillator padera.
4.The vuto la akufa zone, ngati mukuona kuti ndi lalikulu kwambiri, ndiye kuwonjezera pansi kudzera pa izo.
5. Kumayambiriro kwa mawaya, ayenera kuchitiridwa mofanana kwa mawaya pansi, tiyenera waya pansi bwino pamene mawaya, sangadalire kuwonjezera vias akamaliza CCL kuthetsa pini pansi kwa kugwirizana, zotsatira zake kwambiri. zoipa.
6. Ndibwino kuti musakhale ndi Angle yakuthwa pa bolodi (= 180 °), chifukwa kuchokera ku mawonedwe a electromagnetism, izi zidzapanga antenna yotumizira, kotero ndikupangira kugwiritsa ntchito m'mphepete mwa arc.
7. Multilayer pakati wosanjikiza mawaya malo spare, musati mkuwa, chifukwa n'zovuta kuti CCL "yokhazikika"
8.zitsulo mkati mwa zipangizo, monga radiator yachitsulo, zitsulo zowonjezera zitsulo, ziyenera kukwaniritsa "maziko abwino".
9.Chida chozizira chachitsulo chokhazikika chamagetsi atatu ndi lamba wodzipatula pafupi ndi crystal oscillator ayenera kukhala okhazikika. Mwachidule: CCL pa PCB, ngati vuto grounding anasamalidwa bwino, ayenera kukhala "zabwino kwambiri kuposa zoipa", akhoza kuchepetsa mzere chizindikiro backflow dera, kuchepetsa chizindikiro kunja electromagnetic kusokoneza.