Kubva kuPCB world, Kurume, 19, 2021

Patinenge tichiita PCB dhizaini, tinowanzosangana nematambudziko akasiyana, akadai senge impedance matching, EMI mitemo, etc. Ichi chinyorwa chakanyora mimwe mibvunzo nemhinduro zvine chekuita nePCB inomhanya kumunhu wese, uye ndinovimba ichabatsira kumunhu wese.

1. Maitiro ekufunga impedance matching paunenge uchigadzira yakakwirira-kumhanya PCB dhizaini schematics?
Paunenge uchigadzira yakakwira-kumhanya PCB maseketi, impedance yekufananidza ndeimwe yezvinhu zvekugadzira.Iyo impedance kukosha ine hukama hwakakwana neiyo wiring nzira, sekufamba pamusoro pedenga (microstrip) kana yemukati layer (stripline/double stripline), chinhambwe kubva pareferensi layer (simba rekuisa kana pasi layer), wiring wide, PCB zvinhu. , etc. Zvese zvichakanganisa hunhu impedance kukosha kweiyo trace.

Kureva kuti, iyo impedance kukosha inogona kungotemwa mushure mekuita wiring.Kazhinji, iyo yekufananidza software haigone kufunga nezveimwe discontinuous wiring mamiriro nekuda kwekuganhurwa kweiyo redunhu modhi kana masvomhu algorithm inoshandiswa.Panguva ino, mamwe chete materminators (kugumisa), akadai seanotevera kuramba, anogona kuchengetwa pane schematic dhizaini.Deredza mhedzisiro yekusaenderera mberi mukuteedzera impedance.Mhinduro chaiyo yedambudziko ndeyekuedza kudzivirira impedance discontinuities kana wiring.

2. Kana paine akawanda madhijitari / analog basa mabhuroki muPCB board, iyo yakajairika nzira ndeyekuparadzanisa dhijitari / analog pasi.Chikonzero chii?
Chikonzero chekuparadzanisa dhijitari / analog pasi imhaka yekuti dhijitari yedhijitari inoburitsa ruzha musimba uye pasi kana ichichinja pakati pepamusoro uye yakaderera zvinogoneka.Hukuru hweruzha hunoenderana nekumhanya kwechiratidzo uye ukuru hwezvino.

Kana iyo ndege yepasi isina kukamurwa uye ruzha rwunogadzirwa nedhijitari dunhu redunhu rakakura uye matunhu eanarogi ari padyo, kunyangwe kana masaini edhijitari-kune-analogi asingadariki, chiratidzo cheanalogi chicharamba chichikanganiswa nevhu. noise.Kureva kuti, iyo isina kupatsanurwa dhijitari-kune-analogi nzira inogona chete kushandiswa kana anaroji redunhu nharaunda iri kure nedhijitari redunhu nzvimbo inoburitsa ruzha rukuru.

3. Mukumhanya-mhanya PCB dhizaini, ndezvipi zvikamu izvo mugadziri anofanirwa kufunga nezvemitemo yeEMC neEMI?
Kazhinji, EMI/EMC dhizaini inoda kufunga zvese zvakavhenekerwa uye kuitwa maficha panguva imwe chete.Iyo yekutanga ndeye yepamusoro frequency chikamu (> 30MHz) uye yekupedzisira ndiyo yakaderera frequency chikamu (<30MHz).Saka haugone kungoteerera kune yakakwira frequency uye kufuratira iyo yakaderera frequency chikamu.

Iyo yakanaka EMI / EMC dhizaini inofanirwa kutarisisa nzvimbo yechigadzirwa, PCB stack kurongeka, yakakosha nzira yekubatanidza, kusarudzwa kwemudziyo, nezvimwe pakutanga kwegadziriro.Kana pasina gadziriro iri nani pamberi, ichagadziriswa pashure.Ichawana kaviri chigumisiro nehafu yekuedza uye kuwedzera mari.

Semuenzaniso, nzvimbo yewachi jenareta haifanire kunge iri padyo nekunze kwekubatanidza sezvinobvira.High-speed zviratidzo zvinofanira kuenda kune yemukati layer sezvinobvira.Teerera kune hunhu impedance yekufananidza uye kuenderera kweiyo referensi layer kuti uderedze zviratidziro.Chiyero chekuuraya chechiratidzo chinosundirwa nechishandiso chinofanira kunge chiri chidiki sezvinobvira kuderedza kureba.Frequency components, pakusarudza decoupling / bypass capacitors, teerera kuti frequency yayo mhinduro inosangana nezvinodiwa kuderedza ruzha pane simba ndege.

Uye zvakare, teerera kunzira yekudzoka yeiyo yakakwira-frequency chiratidzo chazvino kuita kuti loop nzvimbo ive diki sezvinobvira (kureva, iyo loop impedance diki sezvinobvira) kuderedza radiation.Ivhu rinogona zvakare kukamurwa kudzora huwandu hwepamusoro-frequency ruzha.Chekupedzisira, nyatso sarudza chassis pasi pakati pePCB neimba.

4. Paunenge uchigadzira mabhodhi ePCB, kuitira kuti uderedze kupindira, tambo yepasi inofanira kuumba fomu yakavharwa here?
Paunenge uchigadzira mabhodhi ePCB, iyo loop nzvimbo inowanzoderedzwa kuitira kuderedza kupindira.Paunenge uchiisa mutsara wepasi, haifaniri kuiswa mufomu yakavharwa, asi zviri nani kuironga muchimiro chebazi, uye nzvimbo yepasi inofanira kuwedzerwa sezvinobvira.

5. Nzira yekugadzirisa sei routing topology kuti uvandudze kutendeseka kwechiratidzo?
Rudzi urwu rwechiratidzo chenetiweki rwakanyanya kuoma, nekuti kune unidirectional, bidirectional masaini, uye masaini emazinga akasiyana, maitiro etopology akasiyana, uye zvakaoma kutaura kuti ndeipi topology inobatsira kusaina mhando.Uye kana uchiita pre-simulation, iyo topology yekushandisa inoda zvakanyanya kune mainjiniya, inoda kunzwisiswa kwemisimboti yedunhu, mhando dzechiratidzo, uye kunyange kuoma kwewaya.

6. Nzira yekuita sei nekugadzirisa uye wiring kuti uone kugadzikana kwezviratidzo pamusoro pe100M?
Kiyi kune yakakwirira-yekumhanya yedhijitari chiratidzo wiring ndeyekudzikisa kukanganiswa kwemitsara yekutumira pamhando yechiratidzo.Naizvozvo, kurongeka kwemasaini ekumhanya-mhanya pamusoro pe100M kunoda kuti mitsetse yechiratidzo ive pfupi sezvinobvira.Mumaseketi edhijitari, masaini ekumhanya-mhanya anotsanangurwa nechiratidzo chekunonoka kunonoka nguva.

Uyezve, marudzi akasiyana emasaini (akadai seTTL, GTL, LVTTL) ane nzira dzakasiyana dzekuona chiratidzo chemhando.