Kuburikidza negomba dhizaini yeHDI PCB
Mukumhanya kwePCB dhizaini, akawanda-layer PCB inowanzoshandiswa, uye kuburikidza negomba chinhu chakakosha mukugadzirwa kwePCB yakawanda. Iyo kuburikidza neburi muPCB inonyanya kuumbwa nezvikamu zvitatu: gomba, welding pad nzvimbo yakatenderedza gomba uye SIMBA layer yekuzviparadzanisa nevamwe. Tevere, isu tichanzwisisa iyo yekumhanyisa PCB kuburikidza nedambudziko regomba uye dhizaini zvinodiwa.
Kufurira kuburikidza neburi muHDI PCB
MuHDI PCB multilayer board, iyo yekubatanidza pakati peimwe layer uye imwe layer inoda kubatanidzwa kuburikidza nemakomba. Kana iyo frequency iri pasi pe1 GHz, maburi anogona kuita basa rakanaka mukubatana, uye iyo parasitic capacitance uye inductance inogona kufuratirwa. Kana iyo frequency yakakwira kupfuura 1 GHz, mhedzisiro yeparasitic mhedzisiro yepamusoro-gomba pane chiratidzo chekuvimbika haigone kufuratirwa. Panguva ino, iro rinopfuura-gomba rinopa discontinuous impedance breakpoint munzira yekutapurirana, iyo inotungamira kune chiratidzo chekuratidzira, kunonoka, kudzoreredza uye mamwe masaini ekuvimbika matambudziko.
Kana iyo chiratidzo ichiendeswa kune imwe dura kuburikidza negomba, iyo referensi yemutsara wechiratidzo inoshandawo senzira yekudzoka yechiratidzo kuburikidza negomba, uye ikozvino kudzoka kunoyerera pakati pemareferenzi maseru kuburikidza necapacitive coupling, zvichikonzera mabhomba epasi uye. mamwe matambudziko.
Rudzi rweKunyange-Gomba, Kazhinji, kuburikidza negomba rakakamurwa kuita zvikamu zvitatu: kuburikidza negomba, gomba rebofu uye gomba rakavigwa.
Blind hole: gomba riri kumusoro uye kuzasi kwebhodhi redunhu rakadhindwa, rine humwe hudzamu hwekubatana pakati pemutsara wepamusoro uye mutsara wemukati wemukati. Kudzika kwegomba kazhinji hakupfuuri imwe reshiyo yeaperture.
Gomba rakavigwa: gomba rekubatanidza mukati mechikamu chemukati chebhodhi redunhu rakadhindwa risingapfuuri kusvika pamusoro pebhodhi redunhu.
Kuburikidza negomba: gomba iri rinopfuura nepakati peseti redunhu bhodhi uye rinogona kushandiswa mukati mekubatana kana seyekukwira yekuisa gomba rezvikamu. Nekuti iyo kuburikidza negomba mukuita iri nyore kuwana, mutengo wakaderera, saka kazhinji kudhindwa redunhu bhodhi rinoshandiswa.
Kuburikidza negomba dhizaini mukumhanyisa PCB
Mukumhanya kwePCB dhizaini, iro rinoita serakapusa VIA gomba rinowanzo kuunza mhedzisiro yakaipa kudunhu redhizaini.Kuitira kudzikisa mhedzisiro inokonzerwa neparasitic mhedzisiro yekuboora, tinogona kuedza nepatinogona napo kuti:
(1) sarudza saizi yegomba inonzwisisika.Kugadzira PCB ine multi-layer general density, zviri nani kusarudza 0.25mm/0.51mm/0.91mm (gomba rekuboora/welding pad/SIMBA rekuzviparadzanisa nevamwe) kuburikidza negomba.Kune imwe yakakwirira- density PCB inogona zvakare kushandisa 0.20mm/0.46mm/0.86mm kuburikidza negomba, inogona zvakare kuedza isiri-kuburikidza negomba;Kune magetsi emagetsi kana pasi waya gomba inogona kutariswa kushandisa yakakura saizi kuderedza iyo impedance;
(2) iyo yakakura iyo SIMBA yekuzviparadzanisa nzvimbo, zviri nani. Tichifunga nezvekudzika-gomba density paPCB, inowanzonzi D1=D2+0.41;
(3) edza kusachinja mutsara wechiratidzo paPCB, kureva kuti, edza kuderedza gomba;
(4) kushandiswa kwePCB yakaonda kunobatsira kudzikisa maviri parasitic parameter kuburikidza negomba;
(5) pini yemagetsi uye pasi inofanira kuva pedyo negomba. Iyo yakapfupika inotungamira pakati pegomba nepini, zviri nani, nekuti ivo vanozotungamira kuwedzera kweiyo inductance.Panguva imwecheteyo, iyo magetsi uye kutungamira kwepasi kunofanirwa kunge kwakakora sezvinobvira kuderedza impedance;
(6) isa dzimwe nzvimbo dzekudzika padhuze nemakomba ekupfuura echiratidzo chekuchinjana layer kuti ipe chinhambwe chinhambwe chechiratidzo.
Mukuwedzera, kuburikidza negomba kureba zvakare chimwe chezvinhu zvikuru zvinokanganisa kuburikidza negomba inductance.Kumusoro uye pasi pasi pegomba, pfuura gomba kureba kwakaenzana nePCB ukobvu. Nekuda kwekuwedzera kwenhamba yePCB maseru, ukobvu hwePCB hunowanzosvika kupfuura 5 mm.
Zvisinei, mu high-speed PCB design, kuitira kuderedza dambudziko rinokonzerwa negomba, kureba kwegomba kunowanzodzorwa mukati me 2.0mm.Nekuda kwegomba kureba kupfuura 2.0mm, kuenderera kwegomba impedance inogona kuvandudzwa kune vamwe. mwero nokuwedzera gomba dhayamita.Apo iyo kuburikidza-gomba kureba iri 1.0mm uye pazasi, yakakwana kuburikidza-gomba aperture iri 0.20mm ~ 0.30mm.