Binciken jan ƙarfe ya bazu a ciki PCB

Idan akwai filayen PCB da yawa, SGND, AGND, GND, da sauransu, ana buƙatar amfani da mafi mahimmancin ƙasa azaman nuni ga suturar jan ƙarfe da kansa gwargwadon matsayin hukumar PCB daban -daban, wato, haɗa ƙasa tare.

Akwai dalilai da yawa na sanya jan ƙarfe gaba ɗaya. 1, EMC. Don babban yanki na ƙasa ko samar da wutar lantarki da ke sa jan ƙarfe, zai taka rawar kariya, wasu na musamman, kamar PGND suna taka rawar kariya.

2. Bukatun aiwatar da PCB. Gabaɗaya, don tabbatar da tasirin electroplating, ko babu nakasa na lamination, don allon PCB tare da ƙarancin jan ƙarfe.

3, buƙatun mutuncin sigina, ba da siginar dijital mai yawa madaidaiciya cikakkiyar hanyar komawa baya, da rage wayoyin sadarwar dc. Tabbas, akwai watsawar zafi, buƙatun shigarwa na musamman na kayan shagon jan ƙarfe da sauransu. Akwai dalilai da yawa na sanya jan ƙarfe gaba ɗaya.

1, EMC. Don babban yanki na ƙasa ko samar da wutar lantarki ya shimfiɗa jan ƙarfe, zai taka rawar kariya, wasu na musamman, kamar PGND suna taka rawar kariya.

2. Bukatun aiwatar da PCB. Gabaɗaya, don tabbatar da tasirin electroplating, ko babu nakasa na lamination, don allon PCB tare da ƙarancin jan ƙarfe.

3, buƙatun mutunci na sigina, zuwa siginar dijital na madaidaiciyar madaidaiciyar hanyar komawa baya, da rage wayoyin sadarwa na DC. Tabbas, akwai watsawar zafi, buƙatun shigarwa na musamman na kayan shagon jan ƙarfe da sauransu.

Shago, babban fa’idar jan ƙarfe shine rage ƙarancin ƙasa (akwai babban ɓangaren abin da ake kira anti-jamming shine don rage ƙarancin ƙasa) na da’irar dijital ta wanzu a cikin babban adadin bugun bugun jini, don haka rage ƙasa. impedance ya fi zama dole ga wasu, gabaɗaya an yi imanin cewa don duk da’irar da ta ƙunshi na’urorin dijital ya zama babban bene, don da’irar analog, Ƙarƙashin ƙasa da aka ƙera ta hanyar sanya jan ƙarfe zai haifar da tsangwama na haɗaɗɗen electromagnetic (ban da madaidaiciyar madaidaiciya). Sabili da haka, ba duk da’irori suna buƙatar jan ƙarfe na duniya ba (BTW: aikin shimfidar jan ƙarfe na cibiyar sadarwa ya fi dukan toshe)

Na biyu, mahimmancin sanya jan ƙarfe kewaye yana cikin: 1, sanya jan ƙarfe da waya ƙasa an haɗa su tare, don mu iya rage yankin da’irar 2, yada babban yanki na tagulla daidai don rage juriya na ƙasa, rage matsin lamba a cikin waɗannan maki biyu, duka adadi, ko kwaikwayo ya kamata kwanciya da jan ƙarfe don haɓaka ikon hana tsangwama, kuma a lokacin babban mita yakamata yakamata su shimfiɗa ƙasarsu ta dijital da analog don rarrabe jan ƙarfe, sannan ana haɗa su ta ma’ana ɗaya, Za’a iya haɗa madaidaicin guda ɗaya ta hanyar raunin waya a kusa da zobe na Magnetic sau da yawa. Koyaya, idan mitar ba ta yi yawa ba, ko yanayin aikin kayan aikin ba shi da kyau, yana iya ɗan annashuwa. The crystal oscillator aiki a matsayin high-mita watsawa a cikin kewaye. Kuna iya sa jan ƙarfe a kusa da shi kuma ku fasa harsashin crystal, wanda ya fi kyau.

Menene banbanci tsakanin dukan toshe na jan ƙarfe da grid? Musamman don yin nazari game da nau’ikan tasirin 3: 1 kyakkyawa 2 murƙushe amo 3 don rage tsangwama mai yawa (a cikin sigar da’irar) bisa ƙa’idodin wayoyi: iko tare da samuwar gwargwadon abin da yasa ake ƙarawa grid ah ba ya tare da ƙa’idar bai dace da ita ba? Idan daga mahangar babban mitar, ba daidai bane a cikin madaidaicin madaidaicin madaidaici lokacin da mafi yawan taboo shine wayoyi masu kaifi, a cikin layin samar da wutar lantarki yana da n fiye da digiri 90 yana da matsaloli da yawa. Dalilin da yasa kuke yin hakan gabaɗayan al’amari ne na fasaha: kalli waɗanda aka haɗa da hannu don ganin ko an yi musu fentin haka. Kuna ganin wannan zanen kuma na tabbata akwai guntu akan sa saboda akwai wani tsari da ake kira soldering soldering lokacin da kuke saka shi kuma zai dumama allon gida kuma idan kun saka shi duka a cikin tagulla takamaiman ma’aunin zafi. a bangarorin biyu sun bambanta kuma hukumar za ta ba da labari sannan matsalar ta taso, A cikin murfin ƙarfe (wanda kuma ake buƙata ta hanyar aiwatarwa), yana da sauƙin yin kuskure akan PIN na guntu, kuma ƙin ƙin zai hau cikin madaidaiciya. A zahiri, wannan hanyar kuma tana da rashi: A ƙarƙashin tsarin lalatawar mu ta yanzu: Yana da sauƙi fim ɗin ya manne da shi, sannan a cikin aikin acid, wannan maƙila ba za ta lalace ba, kuma akwai ɓarna da yawa, amma idan akwai, allon kawai ya lalace kuma guntu ne ya sauka hukumar! Daga wannan mahangar, za ku iya ganin dalilin da ya sa aka jawo ta haka? Tabbas, akwai kuma wasu manna tebur ba tare da grid ba, daga mahangar daidaiton samfurin, ana iya samun yanayi 2: 1, tsarin lalata shi yana da kyau sosai; 2. Maimakon siyar da igiyar ruwa, ya karɓi ƙarin walƙiyar wutar makera, amma a wannan yanayin, saka hannun jarin gaba ɗaya zai ninka sau 3-5.