A cikin aiwatar da PCB ƙira, saboda ɓangaren jirgin sama, na iya haifar da jirgin sama na siginar dakatarwa, don ƙananan siginar siginar, ba shi da wani abin da zai yi, a cikin babban tsarin dijital, babban siginar siginar jirgin sama don dawowa, wato hanyar kwarara. , idan reference ᒣ surface katsewa, sigina a fadin karya up, wannan zai kawo matsaloli da yawa, Irin su EMI, crosstalk da sauran matsaloli. A wannan yanayin, ana buƙatar ƙulli don samar da gajeriyar hanyar dawowa don siginar. Hanyoyin sarrafawa na yau da kullun sun haɗa da ƙara ƙarfin ƙarfin dinki da gada:

A. Stiching Capacitor˖

Yawancin lokaci, ana sanya 0402 ko 0603 yumbu capacitor a fadin siginar, kuma ƙarfin ƙarfin ƙarfin shine 0.01uF ko 0.1uF. Idan sarari ya ba da izini, ana iya ƙara da yawa kamar capacitors ˗. A halin yanzu, yi ƙoƙarin tabbatar da cewa layin siginar yana cikin ƙarfin dinki na 200mil. Karamin tazara shine, mafi kyau ˗ da cibiyoyin sadarwa a ƙarshen ƙarshen capacitor daidai da cibiyoyin sadarwar jirgin sama mai nuni wanda sigina ke wucewa. Dubi cibiyoyin sadarwar da aka haɗa a ƙarshen ƙarshen capacitor a cikin Hoto na 1, da cibiyoyin sadarwar biyu daban -daban waɗanda aka haskaka cikin launuka biyu:

Yadda ake yin katako na PCB

B. Gadar sama ˖

Na gama gari shine “fakitin fakitin siginar ƙasa” a cikin siginar siginar a duk sashi, na iya zama fakitin sauran layin siginar cibiyar sadarwa, wannan “fakitin ƙasa” mai kauri sosai, wannan hanyar sarrafawa, koma zuwa adadi mai zuwa

Yadda ake yin katako na PCB

Anan ƙarin bayani ne na gama -gari na rarrabuwa tsakanin giciye ˖

1. Bangaren da ke tafe ˖ a kan jirgi ɗaya, za a iya samun wadatattun wutar lantarki da za a sarrafa, da kuma adadin wutan lantarki a ƙarƙashin iyakance adadin; Bayan cikakken nazari, dole ne mu yi aiki a kan jirgin wutar lantarki. Wani lokaci yana iya zama hutu mai tsabta kuma mai tsabta ˗ kuma wani lokacin ba zai iya guje wa haɗin gwiwa mai ɗorewa ba, kuma yana iya sadaukar da siginar da ba ta da mahimmanci, amma dole ne a gyara ta. Wannan jin kamar tafiya gida ne, kwatsam ya haƙa rami, wannan matsala ce, a kusa da shi, ɗan nisa, mai yiwuwa karen wani ya bi shi; Well,

Kawai gina gada, ko kuna iya komawa gida.

Don haka, ban da kwatancen daji, idan kun yi bangare a cikin PCB, to

Duba layin siginar, ko wani abu na iya faruwa.

2. Yanayin da ke sama ba abu ne mai sauƙi a yi watsi da shi ba, kuma akwai wani halin da za a iya yin watsi da shi. Idan VIA ya yi yawa, yana haifar da yanke jirgin, bayan duka, ɗayan ta hanyar kuma sararin samaniya ya mamaye shi, ƙarin zai ba da abubuwan da za su mamaye, sakamakon ‘yankewa, ba a bayyana wannan yanayin a nan ba gabatarwa ya fi. A wannan yanayin, kuna buƙatar saita ƙa’idodi masu kyau a farkon matakin kuma duba su a hankali a matakin gaba.

Agogo, sake saitawa, sigina sama da 100M kuma ba za a iya raba wasu siginar motar bas ba. Akwai aƙalla jirgi ɗaya cikakke, zai fi dacewa jirgin GND.

Alamar agogo, siginar sauri da sigina masu mahimmanci sun hana rarraba giciye;

Dole ne a daidaita sigina daban -daban zuwa ƙasa don gujewa rarrabuwa ta layi -layi. (Yankin giciye na tsaye gwargwadon iko)

Yadda ake yin katako na PCB

Babban hanyar dawowar mitar duk sigina tana tsaye kai tsaye a ƙarƙashin layin siginar Layer na kusa. Ana iya rage amincin sigina da batutuwan lokaci ta hanyar sanya madauri mai ƙarfi a ƙarƙashin siginar da ke ba da madaidaicin madaidaiciya don siginar. Ya kamata a yi amfani da capacitor kewaye 0.01uF lokacin da rabuwa da ƙetare tsakanin wayoyi da Layer ba zai yiwu ba. Lokacin da ake amfani da madaidaitan madaukai, yakamata a sanya su kusa da tsinkayar layin siginar da ɓangaren ɓangaren.