Inani lezendlalelo ze-PCB lincike enkingeni ye- ibhodi yesifunda. Ngokombono wokucutshungulwa kwe-PCB, i-multi-layer PCB yenziwe nge-“double panel PCB” eminingi ngenqubo yokufaka isitaki nokucindezela. Kodwa-ke, inani lezendlalelo, ukulandelana kwenqwaba kanye nokukhethwa kwebhodi le-multi-layer PCB kunqunywa ngumklami we-PCB, obizwa nge- “PCB stacking design”.

Izici ezizocatshangelwa ekwakhiweni kwe-PCB cascade

Inani lezendlalelo nokuhlelwa komklamo we-PCB kuncike ezintweni ezilandelayo:

1. Izindleko ze-Hardware: Inani lezendlalelo ze-PCB lihlobene ngqo nezindleko zokugcina zehadiwe. Uma kunezendlalelo eziningi, izindleko zehadiwe zizoba zinkulu.

2. Izintambo zezinto eziphakeme kakhulu: izingxenye eziphakeme kakhulu ezimelwe ngamadivayisi we-BGA okupakisha, izingqimba zezintambo zezinto ezinjalo ngokuyisisekelo zinquma izingqimba zezintambo zebhodi le-PCB;

3. Ukulawulwa kwekhwalithi yesiginali: ekwakhiweni kwe-PCB enokugxila kwesiginali esinejubane eliphezulu, uma kugxilwe kukhwalithi yesiginali, kuyadingeka ukunciphisa ukuthanjiswa kwezendlalelo ezincikene ukunciphisa i-crosstalk phakathi kwezimpawu. Ngalesi sikhathi, isilinganiso sezingqimba zezintambo nezendlalelo zesithenjwa (Isendlalelo saphansi noma ungqimba lweMandla) sihamba phambili ku-1: 1, okuzodala ukwanda kwezendlalelo zokwakhiwa kwe-PCB. Ngakolunye uhlangothi, uma ukulawulwa kwekhwalithi yesiginali kungaphoqelekile, uhlelo lwesakhelo sezintambo esiseduze lungasetshenziswa ukunciphisa inani lezendlalelo ze-PCB;

4. Incazelo yesiginali yesikimu: Incazelo yesiginali yesikimu izonquma ukuthi ngabe izintambo ze-PCB “zibushelelezi” yini. Ukuchazwa kwesiginali okungalungile kuzoholela ekuxhumaneni okungalungile kwe-PCB nokwanda kwezendlalelo zezintambo.

5. Isisekelo somthamo wokucutshungulwa komkhiqizi we-PCB: uhlelo lokwakheka kwezitaki (indlela yokufaka isitaki, ukujiya kwesitaki, njll.) Enikezwe ngumklami we-PCB kumele athathe i-akhawunti ephelele yokusebenza okuyisisekelo komkhiqizi we-PCB, njengenqubo yokucubungula, umthamo wemishini yokucubungula, ipuleti le-PCB elisetshenziswa kakhulu imodeli, njll.

Idizayini yokufaka i-PCB idinga ukubeka phambili nokulinganisa wonke la mathonya wokuklama angenhla.

Imithetho ejwayelekile yokuklanywa kwe-PCB cascade

1. Ukwakheka nongqimba lwesiginali kufanele kuhlanganiswe ngokuqinile, okusho ukuthi ibanga phakathi kokwakheka nongqimba wamandla kufanele libe lincane ngangokunokwenzeka, futhi ubukhulu bendawo emaphakathi kufanele bube buncane ngangokunokwenzeka, ukuze kwandiswe amandla phakathi kwesendlalelo samandla nokwakheka (uma ungaqondi lapha, ungacabanga ngamandla we-plate, ubukhulu be-capacitance bulingana ngokulingana nesikhala).

2, izingqimba ezimbili zamasignali ngangokunokwenzeka hhayi ngqo eduze, kulula ukusayina i-crosstalk, kuthinta ukusebenza kwesifunda.

I-3, yebhodi lesifunda elinamasendlalelo amaningi, njengebhodi lezingqimba ezi-4, ibhodi lezingqimba ezi-6, izidingo ezijwayelekile zesendlalelo sesiginali ngangokunokwenzeka kanye nongqimba wangaphakathi kagesi (ungqimba noma ungqimba wamandla) oseduze, ukuze ukwazi ukusebenzisa enkulu indawo yengqimba yethusi yangaphakathi kagesi yokugoqa ukuze ibambe iqhaza ekuvikeleni ungqimba lwesiginali, ukuze kugwenywe ngempumelelo i-crosstalk phakathi kocingo lwesiginali.

4. Ngolwelwesi lwesiginali esinejubane eliphezulu, ngokuvamile lutholakala phakathi kwezendlalelo ezimbili zangaphakathi zikagesi. Inhloso yalokhu ukuhlinzeka ngesendlalelo esivikelekile samasignali wejubane ngakolunye uhlangothi, kanye nokukhawulela amasiginali wejubane eliphakathi kwezendlalelo zombili zangaphakathi kagesi ngakolunye uhlangothi, ukuze kunciphiswe ukuphazamiseka kwezinye izingqimba zesiginali.

5. Cabanga ukulinganisa kwesakhiwo se-cascade.

6. Izendlalelo eziningi zangaphakathi zikagesi zinganciphisa ngempumelelo impedance yokubeka phansi.

Isakhiwo se-cascading esinconyiwe

1, indwangu yokuhlanganisa imvamisa ephezulu kusendlalelo esiphezulu, ukuze uvikele ukusetshenziswa kwezintambo eziphakeme kakhulu emgodini nasekungenisweni kokungeniswa. Imigqa yedatha phakathi kwesihlukanisi esiphezulu nesekhethi esidlulisayo nesamukelayo sixhunywe ngqo ngentambo ephezulu kakhulu.

2. Indiza yaphansi ibekwe ngaphansi kolayini wesiginali wamaza aphezulu ukulawula ukuvinjelwa kocingo lokuxhuma lokuhambisa futhi inikeze nendlela ephansi kakhulu yokuphindisela kwentambo yokubuyela ukugeleza.

3. Beka ungqimba wokuphakelwa kwamandla ngaphansi kongqimba lomhlabathi. Lezi zingqimba ezimbili eziyizithenjwa zakha i-hf bypass capacitor eyengeziwe cishe ye-100pF / INCH2.

4. Amasiginali wokulawula isivinini esiphansi ahlelwe ngentambo engezansi. Le migqa inomugqa omkhulu wokumelana nokuyekiswa kwe-impedance okubangelwa izimbobo, ngaleyo ndlela kuvumele ukuguquguquka okukhulu.

Uyakuqonda yini ukwakheka kwe-PCB cascade

Example Four-ungqimba laminated ipuleti design isibonelo

Uma kudingeka izendlalelo ezengeziwe zokuphakelwa kwamandla kagesi (i-Vcc) noma izendlalelo zesiginali, ungqimba / ungqimba wokunikezwa kwamandla wesibili ongeziwe kufanele uhlanganiswe ngokulingana. Ngale ndlela, isakhiwo esakhiwe ngocwazi sizinzile futhi amabhodi ngeke agobe. Izendlalelo zamandla ezinama-voltages ahlukene kufanele zisondele ekwakhiweni ukukhulisa amandla we-frequency high bypass capacitance futhi ngaleyo ndlela kucindezele umsindo.