Mukupanga mapangidwe a PCB, asanachitike, timakhala ndi zinthu zomwe tikufuna kupanga, ndikuwerengera zomwe zimasungidwa chifukwa cha makulidwe, gawo lapansi, kuchuluka kwa zigawo ndi zina. Pambuyo kuwerengera, zinthu zotsatirazi zimatha kupezeka.

Monga momwe chithunzi chomwe chili pamwambapa, kapangidwe kake kopitilira muyeso komwe kumayendetsedwa ndi ma ohm 50, anthu ambiri amafunsa chifukwa chake pamafunika kuwongolera malinga ndi ma ohs 25 ohms kapena 80?
Choyamba, ma ohms 50 amasankhidwa mwachisawawa, ndipo aliyense mu malonda amavomereza phindu ili. Nthawi zambiri, muyezo winawake uyenera kupangidwa ndi bungwe loyankhidwa, ndipo aliyense akuwasankha molingana ndi muyezo.
Gawo lalikulu laukadaulo wamagetsi limachokera kunkhondo. Choyamba, ukadaulo umagwiritsidwa ntchito pasisitikali, ndipo pang'onopang'ono amasamutsidwa pang'onopang'ono kuchoka kunkhondo kupita ku boma. M'masiku oyambilira a microwave ntchito, pa Nkhondo Yachiwiri Yapadziko lonse, chisankho chosungirako chinatengera zosowa zogwiritsa ntchito, ndipo kunalibe phindu. Ndi kupita patsogolo kwa ukadaulo, miyezo yovuta kwambiri imayenera kuperekedwa kuti ithetse bwino kwambiri zachuma komanso zosavuta.

Ku United States, madontho omwe amagwiritsidwa ntchito kwambiri amalumikizidwa ndi ndodo ndi mapaipi amadzi. 51.5 Ohry ndizofala kwambiri, koma osinthidwe ndi otembenuka omwe amawoneka ndi kugwiritsidwa ntchito ali 50-51.5 mahms; Izi zimasinthidwa kuti zikhale gulu lolumikizana ndi ankhondo. Vuto lotchedwa Jan lidakhazikitsidwa (pambuyo pake Desction), adapangidwa mwapadera ndi mil, ndipo pamapeto pake adasankha ma 10 ohms atapangidwa ndikusinthidwa kukhala zigoba zosiyanasiyana. Miyezo.

Pakadali pano, mu Europe State anali 60Hom. Pambuyo pake, mothandizidwa ndi makampani otchuka a hewlett-pandyt, anakakamizidwa kuti asinthe, ohms 50 pambuyo pake adayamba kukhala muyeso. Yakhala msonkhano, ndipo PCB yolumikizidwa ndi zingwe zosiyanasiyana pamafunika kutsatira miyezo ya 50 ohm yofananira.

Kachiwiri, kapangidwe ka zinthu zonse kumachokera pakuganizira za ntchito yopanga PCB ndikupanga mapangidwe ndi kuthekera.

Kuchokera pakupanga ma pcb popanga ma pcb ndi kukonza zida za mapulogalamu opanga ma pcb omwe alipo, ndizosavuta kutulutsa ma pcbs ndi 50 ohm. Kuchokera pakuwerengera njira yolumikizira, imatha kuwoneka kuti kuchepa kwambiri kumafuna kutalika kwa mzere wa Wider ndi diectric wokulirapo kapena wovuta kwambiri kukumana ndi bolodi apamwamba kwambiri; Kuwonongeka kwakukulu kwambiri kumafuna mzere wocheperako komanso wokulirapo kapena okondana zazing'ono sizikugwirizana ndi kuponderezana kwa EMI ndi Crosstaltalk. Nthawi yomweyo, kudalirika kwa matabwa ophatikizika ndi magawo ambiri ndipo kuchokera pakuwona kwakukulu kudzakhala osauka. Kuwongolera 50 ohm. Popanda chilengedwe chogwiritsa ntchito maasibodi wamba (Fr4, ndi zina zambiri zoyambira, amapanga zinthu zofala zam'madzi (monga 1mm, 1.2mm, etc.). Mbali wamba (4 ~ 10mil) ikhoza kupangidwa. Fakitale ndiyosavuta njira, ndipo zida za zida zake sizokwera kwambiri.

Kuchokera pakuwona kwa kapangidwe ka PCB, ma ohs 50 amasankhidwa pambuyo pakuwona mokwanira. Kuyambira ntchito za PCB, zotsitsa zochepa zimakhala bwino. Kuti mupeze mzere wokhala ndi mzere wopatsidwa, pafupi mtunda wa ndegeyo ndi, EMI yolingana idzachepetsedwa, ndipo mbewu ya Crostal idzachepetsedwa. Komabe, kuchokera pakuwona njira zonsezi, chimodzi mwazinthu zovuta kwambiri zofunika kwambiri zimafunikira, ndiye kuti, kuthekera kwa chip. M'masiku oyambilira, tchipisi zambiri sichitha kuyendetsa mizere yofananira ndi ma ohms 50, ndipo mizere yofananira ndi yolowera kwambiri inali yosavuta kukwaniritsa. Chifukwa chake 50 ohm ikugwiritsidwa ntchito ngati yonyengerera.

Gwero: Nkhaniyi imatengedwa kuchokera pa intaneti, ndipo chinsinsi chake ndi cha wolemba woyamba.