Menene Babban-Mitattarar PCB

PCBs masu ƙarfi gabaɗaya suna ba da kewayon mitar 500MHz zuwa 2 GHz, wanda zai iya biyan buƙatun ƙirar PCB mai sauri, microwave, mitar rediyo da aikace-aikacen hannu. Lokacin da mitar ta fi 1 GHz girma, za mu iya ayyana shi azaman babban mitar.

A yau, rikitaccen kayan aikin lantarki da maɓalli na ci gaba da ƙaruwa, kuma ana buƙatar saurin sigina fiye da yadda aka saba. Don haka, ana buƙatar mitar watsawa mafi girma. Lokacin haɗa buƙatun sigina na musamman a cikin abubuwan da aka haɗa da samfuran lantarki, PCB mai ƙarfi yana da fa'idodi da yawa, kamar babban inganci, saurin sauri, ƙarancin ƙarancin ƙarfi, da ci gaba da dielectric akai-akai.

PCB mai girma - kayan aiki na musamman

Ana buƙatar abubuwa na musamman don gane yawan mitar da aka bayar ta irin wannan nau'in allon da'irar da aka buga, Domin duk wani canjin izininsu na iya yin tasiri ga rashin ƙarfi na PCBs. Mutane da yawa PCB zanen kaya zabi Rogers dielectric abu domin shi yana da ƙananan dielectric asarar, ƙananan sigina asarar, ƙananan kewaye masana'antu halin kaka, kuma ya fi dace da m turnaround samfurin aikace-aikace tsakanin sauran kayan.

Ƙwararrun Layout na PCB Mai Girma

1. Ƙananan gubar tsakanin fitattun na'urorin lantarki masu sauri suna lanƙwasa mafi kyau

Wayar gubar na na'urar da'ira mai girma ta fi dacewa da cikakken layi, wanda ke buƙatar juyawa, kuma ana iya naɗe shi ta layin digiri 45 ko madauwari. Ana amfani da wannan buƙatun kawai don haɓaka ƙarfin daidaitawar foil ɗin jan ƙarfe a cikin ƙananan ƙananan mita, kuma a cikin babban mita, abun ciki ya gamsu. Ɗayan bukata shine a rage watsawa waje da haɗa juna na sigina masu tsayi.

2. Babban na'urar kewayawa tsakanin fil yadudduka a madadin ƙasa da zai yiwu

Abin da ake kira "mafi ƙanƙantar musanya tsakanin yadudduka na jagora ya fi kyau" yana nufin cewa kaɗan ta hanyar amfani da tsarin haɗin ɓangarorin, mafi kyau. A via iya kawo game da rarraba capacitance na game da 0.5pF, da kuma rage yawan via iya muhimmanci ƙara gudu da kuma rage yiwuwar data kurakurai.

3. Gubar tsakanin fitilun na'urorin da'irar maɗaukakiyar mitoci kaɗan ne gwargwadon yiwuwa

Ƙarfin hasken siginar yana daidai da tsawon alamar siginar. Yayin da babban siginar siginar siginar ya fi tsayi, yana da sauƙi don haɗawa da sashin kusa da shi, don haka ga agogo kamar sigina, crystal, bayanan DDR, Layukan sigina masu girma kamar layin LVDS, layin USB, da layin HDMI ana buƙatar zama gajere gwargwadon yiwuwa.

4. Kula da "crosstalk" da aka gabatar ta hanyar layin sigina da layin layi na gajeren nisa

Manyan Matsalolin Uku Na Ƙirƙirar PCB Mai Sauri

Lokacin aiki akan ƙirar PCB mai saurin gudu, akwai ton na al'amurran da za ku ci karo da su tare da hanyar samun siginar ɗinku suna hulɗa daga aya A zuwa aya B. Amma daga cikinsu duka, manyan abubuwan damuwa guda uku da za ku sani sune:

Lokaci. A wasu kalmomi, shin duk siginonin da ke kan shimfidar PCB ɗinku suna zuwa a lokacin da ya dace dangane da wasu sigina? Dukkan sigina masu saurin gudu akan shimfidar allon allo ana sarrafa su ta hanyar agogo, kuma idan lokacin ku ya ƙare, to ƙila za ku sami gurɓatattun bayanai.

Mutunci. A wasu kalmomi, shin siginoninku suna yin kama da yadda ya kamata lokacin da suka isa ƙarshen inda suke? Idan ba haka ba, to yana nufin cewa alama alama ta iya fuskantar wasu tsangwama a hanyar da ta lalata amincinta.

Surutu A wasu kalmomi, shin siginoninku sun ci karo da kowane irin tsangwama a tafiyarsu daga mai aikawa zuwa mai karɓa? Kowane PCB yana fitar da wani nau'in hayaniya, amma lokacin da hayaniya ta yi yawa, to za ku ƙara damar lalata bayanai.

Yanzu, labari mai daɗi shine cewa waɗannan Manyan Matsaloli guda uku da zaku iya fuskanta akan ƙirar PCB mai sauri duk ana iya gyara su ta waɗannan Manyan Magani uku:

Impedance. Samun madaidaicin madaidaicin tsakani na watsawa da mai karɓa zai yi tasiri kai tsaye akan inganci da amincin siginar ku. Wannan kuma zai shafi yadda siginoninku suke da hankali ga amo.

Daidaitawa. Daidaita tsawon sawu biyu masu haɗe-haɗe zai tabbatar da cewa sawun ku ya zo a lokaci guda kuma tare da ƙimar agogon ku. Daidaitawa shine mahimman bayani don duba DDR, SATA, PCI Express, HDMI, da aikace-aikacen USB.

Tazara Makusancin sawun ku yana kusa da juna, zai zama mafi sauƙi ga surutu da sauran nau'ikan kutse na sigina. Ta hanyar rashin sanya alamunku kusa fiye da yadda ake buƙata, za ku rage yawan hayaniya a kan allo.

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