Daga duniyar PCB, Maris, 19, 2021

Lokacin yin ƙirar PCB, sau da yawa muna haɗuwa da matsaloli da yawa, kamar ƙa'idodin Eemi, da sauransu wannan labarin ya tattara wasu tambayoyi don kowa da kowa, kuma ina fata zai taimaka wa kowa da kowa.

1. Yadda za a yi la'akari da daidaitawa lokacin da ke tsara tsarin tsari na PCB mai sauri?
A lokacin da ƙirar da'irar PCB mai sauri-sauri, wanda ya dace daidai shine ɗayan abubuwan ƙira. Darajar rashin daidaituwa tana da cikakkiyar dangantaka tare da hanyar watsa shirye-shirye, kamar tafiya ta hanyar Layer (Mallaka) ko Flood Layer), wirelon ƙasa), wirtra abu), da sauransu.

Wannan shine a ce, ƙimar mara kyau za'a iya tantance shi bayan wiring. Gabaɗaya, software na tantancewa ba za ku iya yin la'akari da wasu yanayin wayoyi ba saboda iyakancewar ƙirar da'irar ko kuma algorithm amfani. A wannan lokacin, wasu magabata kawai (karewa), kamar su na juriya, za a iya ajiye su a kan zane mai tsari. Rage tasirin dakatarwa a cikin ganowa. Magani na ainihi don matsalar ita ce ƙoƙarin guje wa rashin daidaiton ɓoye lokacin da yake wiring.

2. Lokacin da akwai aikin aikin dijital / analog da yawa a cikin jirgi na PCB, hanyar al'ada ita ce raba yanki / analog ƙasa. Mecece dalili?
Dalilin raba digalital / analog ƙasa shine saboda da'irar dijital zai samar da amo a cikin iko da ƙasa lokacin juyawa tsakanin manyan da ƙananan m. Girman hayaniyar yana da alaƙa da saurin siginar da girman yanayin na yanzu.

Idan an rarraba jirgin ƙasa da amo da aka samu ta hanyar da'irar yankin dijital tana da kusa, har yanzu alamar analog ba zata iya yin ta hanyar haɗuwa da amo ba. Wato hanya ce ta hanyar dijital-to-analog kawai lokacin da yankin kewaye analog ya yi nisa daga yankin dijital wanda ya haifar da manyan amo.

3. A cikin ƙirar PCB mai tsayi-sauri, waɗanda abubuwan da ya kamata mai ƙira ra'ayi la'akari da dokokin EMC da Eemi?
Gabaɗaya, ƙirar EMI / EMC tana buƙatar la'akari da duka radiated kuma an gudanar da wasu bangarorin a lokaci guda. Da farko dai shi ne mafi girman ɓangaren mita (> 30mhz) da kuma ƙarshen shine ƙananan ɓangaren ɓangare (<30mhz). Don haka ba za ku iya kula da babban mitar kuma yi watsi da ƙarancin mita ba.

Kyakkyawan ƙirar EMI / EMC dole ne la'akari da wurin na'urar, Tsarin haɗin PCB, hanyar haɗin haɗin PCB, hanyar haɗin haɗin yanar gizo, zaɓi na na'urarku, da sauransu a farkon layout. Idan babu kyakkyawan tsari tunda, za a magance shi bayan haka. Zai sami sau biyu sakamakon tare da rabin ƙoƙarin da ƙara farashin.

Misali, wurin mai janareta bai kamata ya kusanci mai haɗin kai na waje ba. Alamar manyan-sauri ta shiga Layer na ciki kamar yadda zai yiwu. Kula da halayyar da ya dace da ci gaba da tunani mai zurfi don rage tunani. Yawan kashe siginar siginar ta tura ta hanyar na'urar ya zama kaɗan don rage tsawo. Abubuwan haɗin mitsar, lokacin da suka zabar sarai masu karfin gwiwa / kewaye, kula da ko amsar mita ya cika da bukatun jirgin saman wuta.

Bugu da kari, kula da makomar siginar siginar yanzu don sanya madaidaicin madauki a matsayin kananan-yiwu (wato, madauki yana madauki kaɗan kamar yadda zai yiwu) don rage wadatarwa. Har ila yau, ƙasa za a raba don sarrafa hayaniyar amo. A ƙarshe, da kyau zaɓi chassis ƙasa tsakanin PCB da Gidaje.

4. Lokacin da yin allon PCB, don rage rage tsangwama, ya kamata waya ta wayar da aka rufe?
Lokacin yin allon PCB, yankin madauki an rage shi ne don rage tsangwama. A lokacin da kwanciya layin ƙasa, bai kamata a dage farawa a cikin rufaffiyar tsari ba, amma ya fi kyau shirya shi a cikin sifar reshe, kuma yankin ƙasa ya kamata a ƙara gwargwadon iko.

5. Yadda za a daidaita Taron Jiki don inganta amincin alama?
Irin wannan hanyar siginar siginar cibiyar sadarwa tana da rikitarwa, saboda don bayyanawar manufa, da wuya tasoshin matakan daban-daban, kuma yana da wuya a faɗi wanda ke da amfani ga ingancin siginar. Kuma idan yin pre-schulation, wanda triology don amfani dashi yana da matukar buƙata a kan injiniyoyi, buƙatar fahimtar ka'idodi na da'ira, da kuma nau'ikan sigina, har ma da wirging wahala.

6. Yadda za a magance layout da wayoyi don tabbatar da kwanciyar hankali na sigina sama da 100m?
Makullin zuwa Wiring Sigin Sigurin Religist shine don rage tasirin hanyoyin watsa labarai akan ingancin sigina. Sabili da haka, layout na manyan sigina sama da 100m na ​​buƙatar alamun alamun ya jawo zama kaɗan. A cikin da'irar dijital, ana bayyana alamun girman-sauri ta hanyar hauhawar farashin sasantawa.

Haka kuma, nau'ikan sigina (kamar ttl, GTL, LVTL) suna da hanyoyi daban-daban don tabbatar da ingancin sigina.