Idizayini ye-lamonated ikakhulukazi ihambisana nemithetho emibili:
1. Ungqimba ngalunye lwe-wiring kumele lube nesendlalelo eseduze sereferensi (amandla noma ungqimba lomhlabathi);
2. Isendlalelo samandla asemqoka esiseduze kanye nesendlalelo somhlabathi kufanele sigcinwe ngebanga elincane ukuhlinzeka nge-cappitance enkulu yokuhlanganisa;
Lokhu okulandelayo kubala isitaki esivela ebhodini elinamamitha amabili kuya ebhodini eliyisishiyagalombili ngokwesibonelo:
1. Ibhodi le-PCB eliseceleni elilodwa ne-PCB Board Board
Kumabhodi amabili engqimba, ngenxa yenombolo encane yezendlalelo, ayiseyona inkinga yokumangalisa. Ukulawulwa kwemisebe ye-EMI kubhekwa ikakhulukazi kwi-wiring nesakhiwo;
Ukuhambisana kwe-electromagnetic kwamabhodi angqimba olulodwa namabhodi ezingqimba eziphindwe kabili kuye kwagqama ngokwengeziwe. Isizathu esiyinhloko salesi simo ukuthi indawo yokungena yesiginali inkulu kakhulu, engakhiqizi kuphela imisebe eqinile kagesi, kodwa futhi yenza umjikelezo uzwele ekuphazanyisweni kwangaphandle. Ukuze uthuthukise ukuhambisana kwe-electromagnetic komjikelezo, indlela elula ukunciphisa indawo ye-loop yesiginali yokhiye.
Isiginali Key: Ngokombono wokuhambisana kwe-electromagnetic, amasiginali asemqoka ikakhulukazi abhekisela kwizibonakaliso ezikhiqiza imisebe eqinile kanye namasiginali azwela emhlabeni wangaphandle. Amasiginali angakhiqiza imisebe eqinile ngokuvamile amasiginali ngezikhathi ezithile, afana namasiginali we-oda aphansi amawashi noma amakheli. Amasiginali azwela ukuphazamiseka kukhona amasiginali we-analog anamazinga aphansi.
Amabhodi angashadile futhi anezingqimba ajwayele asetshenziswa kuma-analog afinyelela ku-analog aphansi ngaphansi kwe-10KHZ:
1) Ukulandelwa kwamandla kungqimba efanayo kuholwa kakhulu, futhi ubude bemigqa buncishisiwe;
2) Uma kugijima izintambo zomhlaba kanye nezintambo zomhlaba, kufanele zisondelene; Beka ucingo lomhlabathi eceleni kwentambo yesiginali yokhiye, futhi lo mhlabathi womhlaba kufanele usondele ngangokunokwenzeka ocingweni lwesiginali. Ngale ndlela, kwakhiwa indawo encane ye-loop kanye nokuzwela kwemisebe yemodi ehlukile ekuphazanyisweni kwangaphandle kuyancipha. Lapho i-wire yomhlabathi ingezwa eduze kwentambo yesiginali, i-loop enendawo encane kunazo zonke yakhiwa, futhi nakanjani isiginali yamanje izothatha leloop esikhundleni sezinye izintambo zomhlaba.
3) Uma kuyibhodi yesekethe elisezingeni eliphakeme, ungabeka ucingo lomhlaba oluseceleni komugqa wesiginali ngakolunye uhlangothi lwebhodi yesekethe, ngokushesha ngaphansi komugqa wesiginali, bese kuthi umugqa wokuqala kufanele ube kabanzi ngangokunokwenzeka. Indawo yeLoop eyakhiwe ngale ndlela ilingana nobukhulu bebhodi lesekethe eliphindwe ngobude bomugqa wesiginali.
Ama-laminate amabili nane
1. I-SIG-GND (PWR) -PWR (GND) -Sig;
2. I-GND-SIG (PWR) -SIG (PWR) -GND;
Kule miklamo emibili engenhla, inkinga engahle ibe khona ngebhodi lebhodi lendabuko le-1.6mm (62mil). Isikhala se-waleya sizoba sikhulu kakhulu, okungathandeki kuphela ngokulawula ukungcola, ukuhlangana nokuhlangana nokuvikelwa; Ikakhulu, ukuhlukaniswa okukhulu phakathi kwezindiza zomhlaba wamandla kunciphisa amandla ebhodi futhi akusilungele ukuhlunga umsindo.
Okwesikimu sokuqala, kuvame ukusetshenziselwa isimo lapho kunama-chip amaningi ebhodini. Lolu hlobo lweSikimu lungathola ukusebenza okungcono lwe-SI, aluhle kakhulu ekusebenzeni kwe-EMI, ikakhulukazi ngokusebenzisa i-wiring neminye imininingwane yokulawula. Ukunakwa okuyinhloko: Isendlalelo somhlaba sibekwe kwisendlalelo sokuxhuma sesendlalelo sesiginali ngesiginali emikhulu, ezuzisa ukudonsa futhi icindezele imisebe; Khulisa indawo yeBhodi ukubonisa umthetho we-20h.
Ngokuqondene nesixazululo sesibili, kuvame ukusetshenziswa lapho ubuningi be-chip ebhodini buphansi ngokwanele futhi kunendawo eyanele ezungeze i-chip (beka i-waller yamandla adingekayo). Kulesi sikimu, ungqimba lwangaphandle lwe-PCB lungqimba lomhlabathi, futhi izingqimba ezimbili eziphakathi ziyizigaba / zezendlalelo zamandla. Ukuhlinzekwa kwamandla engxenyeni yesiginali kuhanjiswa ngomugqa obanzi, okungenza indlela yokuvikelwa kwamandla kagesi iphansi, futhi ukungcola kwendlela ye-MicroSTRIP ye-Microsoft nakho kuphansi, futhi imisebe yesiginali yangaphakathi ingavikelwa ungqimba lwangaphandle. Ngokombono wokulawulwa kwe-EMI, lesi sakhiwo esihle kakhulu se-PCB se-4.
Ukunakwa okuyinhloko: ibanga phakathi kwezingqimba ezimbili eziphakathi kwezimpawu nezingqimba zamandla okuxubile kufanele zinwetshwe, futhi indlela yokuxhuma izintambo kufanele ibe mpo ukugwema i-crosstalk; Indawo yeBhodi kufanele ilawulwe ngokufanele ukubonisa umthetho we-20h; Uma ufuna ukulawula i-wiring impedance, isixazululo esingenhla kufanele siqaphele kakhulu ukuthi izintambo zihlelwe ngaphansi kwesiqhingi sethusi ukuze zinikezwe amandla namandla. Ngaphezu kwalokho, ithusi ekunikezelweni kwamandla noma ungqimba lomhlaba kufanele luxhumeke ngangokunokwenzeka ukuze kuqinisekiswe ukuthi kuxhumeke i-DC kanye nokuvama imvamisa.
Ama-laminate amathathu, ayisithupha
Ngemiklamo enobunzima obuphezulu be-chip kanye ne-Clock Frequency Frequency, kufanele kubhekwe umklamo webhodi le-6, futhi indlela yokufaka iyanconywa:
1. I-SIG-GND-SIG-PWR-GND-GND-SIG;
Ngalolu hlobo lweSikimu, lolu hlobo lwe-LEMEMEME LEAMEME lungathola ubuqotho obungcono besiginali, ungqimba lwesiginali lusondelene nongqimba lomhlabathi, ungqimba lwamandla kanye ne-stratum ngayinye kungalawulwa kangcono, kanti ama-stratum angenayo angadonsa kahle imigqa yamanzi kazibuthe kahle. Futhi lapho ukuhlinzekwa kwamandla kanye nongqimba lomhlabathi sekuqediwe, kunganikeza indlela engcono yokubuyisela isendlalelo ngasinye sesiginali.
2. I-GND-SIG-GND-PWR-SIG -GND;
Ngalolu hlobo lweSikimu, lolu hlobo lweSikimu lulungele isimo kuphela ukuthi lolu hlelo lokusebenza lungaphezulu kakhulu, lolu hlobo lokushisa lunazo zonke izinzuzo ze-Upper Lamination, kanye neplanethi emhlabathini ephezulu futhi ephansi ingasetshenziswa njengesendlalelo esingcono sokuvikela. Kumele kwaziwe ukuthi ungqimba lwamandla kufanele abe seduze kwesendlalelo okungeyona ingxenye enkulu yengxenye, ngoba indiza yesendlalelo engezansi izoqedwa. Ngakho-ke, ukusebenza kwe-EMI kungcono kunekhambi lokuqala.
Isifinyezo: Okwesikimu sebhodi lesithupha, ibanga phakathi kwesendlalelo samandla kanye nongqimba lomhlabathi kufanele kuncishiswe ukuthola amandla amahle nokuhlangana komhlaba. Kodwa-ke, yize ubukhulu bebhodi bungama-62mil kanye nesikhala sengqimba sehlisiwe, akulula ukulawula isikhala phakathi kokunikezwa kwamandla amakhulu kanye nongqimba lomhlabathi ukuba lube mncane. Ukuqhathanisa uhlelo lokuqala nohlelo lwesibili, izindleko zesikimu sesibili zizokhuphuka kakhulu. Ngakho-ke, sivame ukukhetha inketho yokuqala lapho sifaka. Lapho uklama, landela umthetho we-20h kanye nomthetho wobumbano wesibuko.
Ama-laminate amane nesishiyagalombili
1. Le akuyona indlela enhle yokufaka ngenxa yokufakwa kabi ngogesi namandla amakhulu okuhlinzekwa kwamandla. Isakhiwo saso simi ngokulandelayo:
I-1.Signal 1 Ingaphezulu Lengxenye, I-MicroSTrip Wiring ungqimba
2. Isiginali 2 I-MicroSTRIP Wiring ungqimba, ungqimba olungcono lwe-wiring (x ukuqondisa)
Indawo
I-4
5.Signal 4 Stripne Rounting ungqimba
I-OnePlower
7. Isiginali 5 I-MicroSTRIP Wiring ungqimba
8.Signal 6 MicroSTRIP TRACE ungqimba
2. Ukuhluka kwendlela yesithathu yokufaka. Ngenxa yokungezwa kwesendlalelo sereferensi, kunokusebenza okungcono kwe-EMI, kanye nesimo sokuvikelwa kwesendlalelo ngasinye sesiginali kungalawulwa kahle
I-1.Signal 1 indawo engaphezulu, ungqimba lwe-microstrip wiring, ungqimba oluhle lwe-wiring
2. I-Ground stratum, ikhono elihle lokumuncwa nge-electromagnetic
I-3. Isiginali 2 Stripneng ungqimba, ungqimba oluhle
4
6.Signal 3 Stripne Rounting ungqimba, ungqimba oluhle lomzila
7. I-Power Stratum, enamandla amakhulu okuhlinzekwa kwamandla
8.Signignal 4 microsrip wiring ungqimba, ungqimba oluhle lwe-wiring
I-3. Indlela enhle yokufaka, ngenxa yokusebenzisa izindiza zombhalo we-multi-ungqimba, inekhono elihle kakhulu lokufakwa kwe-geomagnetic.
I-1.Signal 1 indawo engaphezulu, ungqimba lwe-microstrip wiring, ungqimba oluhle lwe-wiring
2. I-Ground Stratum, Ikhono elingcono le-electromagnetic wave
I-3. Isiginali 2 Stripneng ungqimba, ungqimba oluhle
I-4.Power ungqimba wamandla, yakha ukumuncwa okuhle kakhulu kwe-electromagnetic ngesendlalelo somhlaba esingezansi kwe-5.Ukubuya komhlaba
6.Signal 3 Stripne Rounting ungqimba, ungqimba oluhle lomzila
7
8.Signignal 4 microsrip wiring ungqimba, ungqimba oluhle lwe-wiring
Ungayikhetha kanjani ukuthi zingaki izingqimba zamabhodi asetshenziswayo ekwakhiweni nokuthi uzifaka kanjani ezintweni eziningi ezifana nenombolo yamanethiwekhi wesiginali ebhodini, inqwaba yedivayisi, imvamisa yesiginali, usayizi webhodi nokunye. Kufanele sibheke lezi zinto ngendlela ephelele. Ngamanethiwekhi wesiginali amaningi, akhuphuka ngobuningi bedivayisi, akhuphuka ngobuningi be-PIN kanye nemvamisa yesiginali, umklamo webhodi le-multilayer kufanele amukelwe ngangokunokwenzeka. Ukuthola ukusebenza okuhle kwe-EMI, kungcono kakhulu ukuqinisekisa ukuthi ungqimba ngalunye lwesiginali lunesethenjwa salo.