Kusuka kuPCB World, Mashi, 19, 2021
Lapho wenza idizayini ye-PCB, sivame ukuhlangana nezinkinga ezahlukahlukene, njengokuqhathanisa, imithetho ye-EMI, njll. Le ndatshana ihlanganise eminye imibuzo nezimpendulo ezihlobene nawo wonke umuntu, futhi ngithemba ukuthi kuzosiza wonke umuntu.
1. Ungacabangisisa kanjani ukuqhathanisa lapho uklama ama-PCB Design Design Schematics?
Lapho uklama imibuthano ye-PCB ephezulu, ukufana kwe-Imperance kungenye yezinto zokuklama. Inani le-Imperance linobudlelwano obuphelele nendlela ye-wiring, njengokuhamba ngezinyawo (i-microSTRIP) noma i-stripline engaphakathi (i-stripline / i-stripline (i-pcb matle), i-PCB Mail, njll. Kokubili kuzothinta inani lokuvimbela isimilo se-trace.
Lokho kusho ukuthi, inani lokuphazamiseka linganqunywa kuphela ngemuva kwe-wiring. Ngokuvamile, isoftware sekulingisa ayikwazi ukubheka eminye imibandela yokunqamula kwe-wiring ngenxa yokulinganiselwa kwemodeli yesifunda noma i-algorithm yezibalo esetshenzisiwe. Ngalesi sikhathi, kuphela ama-terminators (ukunqanyulwa), njengokumelana kochungechunge, angagcinwa kumdwebo we-schematic. Ukudambisa umphumela wokungahlukaniswa ngokulandela ukubulawa kwabantu. Isixazululo sangempela senkinga ukuzama ukugwema ukunqanyulwa kokuphazamiseka lapho i-wiring.
2. Lapho kunamabhulokhi womsebenzi amaningi wedijithali / we-analog ebhodini le-PCB, indlela ejwayelekile ukuhlukanisa umhlabathi wedijithali / we-analog. Siyini isizathu?
Isizathu sokuhlukanisa umhlabathi wedijithali / we-analog yingoba umjikelezo wedijithali uzokhiqiza umsindo emandleni nasemhlabathini lapho ushintsha phakathi kwamandla aphezulu naphansi. Ubukhulu bomsindo buhlobene nejubane lesiginali kanye nobukhulu bamanje.
Uma indiza yomhlabathi ihlukaniswe futhi umsindo okhiqizwe umjikelezo wendawo yedijithali yimikhulu futhi amasekethe endawo ye-analog asondele kakhulu, noma ngabe izibonakaliso ze-analog zisondele kakhulu, noma ngabe izibonakaliso ze-analog zisondele kakhulu, isibonakaliso se-analog sisazophazanyiswa ngumsindo womhlaba. Lokho kusho ukuthi, indlela engahlukaniswanga yedijithali-to-to-analog yedijithali ingasetshenziswa kuphela lapho indawo yokujikeleza ye-analog ikude nendawo yokujikeleza kwedijithali eyakha umsindo omkhulu.
I-3. Ngokwakheka kwe-PCB ephezulu kakhulu, yiziphi izici okufanele umqambi acabangele imithetho ye-EMC ne-EMI?
Ngokuvamile, umklamo we-EMI / EMC udinga ukubheka zombili izici ezikhulile neziqhutshwa ngasikhathi sinye. Okwedlule kwengxenye yemvamisa ephakeme (> 30mhz) kanye nalokhu okugcina yingxenye yemvamisa ephansi (<30MHZ). Ngakho-ke awunakunaka nje ukunaka imvamisa ephezulu futhi unganaki ingxenye yemvamisa ephansi.
Idizayini enhle ye-EMI / EMC kumele icabangele indawo yedivayisi, ilungiselelo lesitaki le-PCB, indlela ebalulekile yokuxhuma, indlela yokuxhuma ebalulekile, ukukhethwa kwedivayisi, njll ekuqaleni kwesakhiwo. Uma kungekho lungiselelo elingcono ngaphambi kwesikhathi, lizoxazululwa ngemuva kwalokho. Kuzothola ukuphinde kube ngumphumela ngomzamo wengxenye futhi wandise izindleko.
Isibonelo, indawo generator yewashi akufanele isondelene nesixhumi sangaphandle ngangokunokwenzeka. Amasignali aphezulu aphezulu kufanele ahambe ungqimba lwangaphakathi ngangokunokwenzeka. Naka ukuqondana kokufanisa kokufanisa kanye nokuqhubeka kwesendlalelo sereferensi ukuze unciphise ukuboniswa. Izinga elibulewe lesiginali licindezelwe yidivayisi kufanele libe lincane ngangokunokwenzeka ukunciphisa ukuphakama. Izakhi zemvamisa, lapho ukhetha ama-capacitors asondelana / wedlula, unake noma ngabe ukuphendula imvamisa kuhlangabezana nezidingo zokunciphisa umsindo ngendiza yamandla.
Ngaphezu kwalokho, naka indlela yokubuya yesiginali yesikhathi esiphezulu samanje ukwenza indawo ye-loop ibe yincane ngangokunokwenzeka (okungukuthi, ukuqunjelwa kwe-loop kuncane ngangokunokwenzeka) ukunciphisa imisebe. Umhlabathi ungahlukaniswa futhi ukulawula uhla lomsindo ovame kakhulu. Ekugcineni, khetha kahle umhlabathi we-CHASSIS phakathi kwe-PCB kanye nezindlu.
4. Lapho wenza amabhodi e-PCB, ukuze unciphise ukuphazamiseka, kufanele umhlabathi we-wire wakha ifomu elivaliwe?
Lapho wenza amabhodi e-PCB, indawo ye-Loop ivame ukuncishiswa ukuze inciphise ukuphazanyiswa. Lapho ubeka umugqa womhlaba, akufanele ubekwe ngendlela evaliwe, kepha kungcono ukuyihlela ekwakhekeni kwegatsha, futhi indawo yomhlabathi kufanele inyuswe ngangokunokwenzeka.
5. Ungayilungisa kanjani i-topology yomzila ukwenza ngcono ubuqotho besiginali?
Lolu hlobo lokuqondisa kwesiginali yenethiwekhi luyinkimbinkimbi ngokwengeziwe, ngoba izibonakaliso ze-Unidirectional, amasiginali we-bidirectional, namasiginali amazinga ahlukene, amathonya e-topology ahlukile, futhi kunzima ukusho ukuthi iyiphi i-topology ezuzisa ikhwalithi yesibonakaliso. Futhi lapho wenza i-pre-sekulingisa, okuyi-topology okufanele uyisebenzise kakhulu onjiniyela, edinga ukuqonda kwemigomo yesifunda, izinhlobo zesiginali, kanye nobunzima be-wiring.
6. Ungabhekana kanjani nesakhiwo ne-wiring ukuze uqinisekise ukuqina kwamasiginali ngenhla kwe-100m?
Isihluthulelo se-wiring yesiginali yedijithali ephezulu kakhulu ukunciphisa umthelela wemigqa yokuhambisa ngekhwalithi yesiginali. Ngakho-ke, ukwakheka kwezimpawu zesivinini esiphezulu ngenhla kwe-100m kudinga ukuthi kulandelwe iziginali zibe mfushane ngangokunokwenzeka. Kumasekethe edijithali, amasiginali wejubane eliphezulu achazwa yisikhathi sokubambezeleka kwesiginali.
Ngaphezu kwalokho, izinhlobo ezahlukene zezimpawu (njenge-TTL, GTL, LVTTL) zinezindlela ezihlukile zokuqinisekisa ikhwalithi yesiginali.