MuPCB dhizaini dhizaini, mamwe mainjiniya haadi kuisa mhangura pamusoro pese pese repasi pasi kuitira kuchengetedza nguva. Ndizvo here? Ko PCB inofanira kunge yakaputirwa mhangura here?
Chokutanga pane zvose, tinofanira kujekesa: pasi pasi mhangura yemhangura inobatsira uye inofanirwa kuPCB, asi iyo yemhangura yemhangura pabhodhi rose inofanira kusangana nemamwe mamiriro ezvinhu.
Zvakanakira zvepasi mhangura plating
1. Kubva pakuona kweEMC, nzvimbo yose yepasi pasi yakafukidzwa nemhangura, iyo inopa humwe kudzivirirwa kwekudzivirira uye kudzvinyirira ruzha rwechiratidzo chemukati uye chiratidzo chemukati. Panguva imwecheteyo, inewo imwe chengetedzo yekudzivirira yemidziyo yepasi uye zviratidzo.
2. Kubva pakuona kwekupisa kupisa, nekuda kwekuwedzera ikozvino kwePCB board density, BGA main chip inodawo kufunga nezvekupisa kupisa nyaya zvakanyanya. Iyo yese yedunhu bhodhi inoiswa pasi nemhangura kuti ivandudze kupisa kwekupisa kugona kwePCB.
3. Kubva pane imwe nzira yekuona, bhodhi rose rinogadziriswa nemhangura kuita kuti PCB board igoverwe zvakaenzana. PCB kukotama uye kuputika kunofanirwa kudzivirirwa panguva yePCB kugadzirisa uye kudzvanya. Panguva imwecheteyo, kushushikana kunokonzerwa nePCB reflow soldering hakuzokonzerwi nefoiri yemhangura isina kuenzana. PCB warpage.
Chiyeuchidzo: Kune maviri-layer mapuranga, copper copper inodiwa
Kune rimwe divi, nekuti iyo-ye-layer board haina yakakwana yekunongedza ndege, iyo yakarongwa pasi inogona kupa nzira yekudzoka, uye inogona zvakare kushandiswa senge coplanar referensi kuzadzisa chinangwa chekudzora impedance. Isu tinokwanisa kazhinji kuisa ndege yepasi pasi pasi, uye toisa zvikamu zvikuru uye mitsara yemagetsi uye mitsetse yechiratidzo pamusoro pepamusoro. Kune yakakwira impedance maseketi, analog maseketi (analog-to-digital kushandura maseketi, switch-mode simba rekushandura maseketi), copper plating itsika yakanaka.
Mamiriro ekugadzira mhangura pasi
Kunyangwe iyo yepasi pasi yemhangura yakanyatsokodzera PCB, ichiri kuda kusangana nemamwe mamiriro:
1. Isa zvakanyanya sezvinobvira panguva imwe chete, usavhara zvose kamwechete, dzivisa ganda remhangura kubva pakuputika, uye uwedzere kuburikidza nemakomba ari pasi pevhu renharaunda yemhangura.
Chikonzero: Iyo yemhangura yemhangura padenga repamusoro inofanira kuputswa uye kuparadzwa nezvikamu uye mitsetse yechiratidzo padanho repamusoro. Kana iyo foil yemhangura isina kudzika pasi zvakanaka (kunyanya iyo yakatetepa uye yakareba foil yemhangura yakaputswa), inova antenna uye kukonzera EMI matambudziko.
2. Funga nezve thermal balance yemapasuru madiki, kunyanya mapasuru madiki, senge 0402 0603, kudzivirira mhedzisiro.
Chikonzero: Kana bhodhi rose redunhu rakaputirwa nemhangura, mhangura yezvikamu zvepini ichave yakanyatsobatanidzwa nemhangura, iyo ichaita kuti kupisa kunopera nokukurumidza, izvo zvichaita kuti kuomerwe mukuparara nekugadzirisa zvakare.
3. Kudzika kwePCB yese yedunhu bhodhi kunonyanya kuenderera mberi. Chinhambwe kubva pasi kuenda kune chiratidzo chinoda kudzorwa kudzivirira discontinuities mukuvhiringidza kwetambo yekufambisa.
Chikonzero: Pepa remhangura riri padhuze zvakanyanya nepasi rinozoshandura iyo impedance yeiyo microstrip transmission line, uye discontinuous copper sheet ichavawo nechakaipa pane iyo impedance discontinuity yetambo yekufambisa.
4. Zvimwe zviitiko zvakakosha zvinoenderana nemamiriro ekushandisa. PCB dhizaini haifanire kunge iri dhizaini yakakwana, asi inofanirwa kuyerwa nekubatanidzwa nedzidziso dzakasiyana siyana.
Chikonzero: Pamusoro pezviratidzo zvinonzwisisika zvinoda kudzika pasi, kana paine mitsetse yakawanda yekumhanya-mhanya uye zvikamu, nhamba huru yediki uye refu mhangura yekupwanya ichagadzirwa, uye nzira dzewaya dzakasimba. Izvo zvinodiwa kuti udzivise makomba akawanda emhangura pamusoro pepamusoro sezvinobvira kuti ubatanidze kune pasi pasi. Iyo yepamusoro pedenga inogona kusarudza imwe kunze kwemhangura.