Everyone knows doing the principle diagram of the PCB is designed into a real piece of PCB, please don’t look down upon this process, there are a lot of things on the principle of practicable in engineering has difficult to achieve, or something that someone can achieve them,but others can not, so it is not difficult to make a PCB, but make a good PCB boto hase ntho e bonolo.
Mathata a mabeli a ka sehloohong naheng ea microelectronics ke phahameng maqhubu pontšo le ba fokolang sebetsa pontšo, PCB hlahisoeng ha boemo ba e haholo-holo bohlokoa ka tsela ena, e tšoanang molao-motheo moralo, metsoako e tšoanang, batho ba fapaneng entse PCB tla ba le sephetho sa tšoaneng, e le mokhoa oa ho etsa ? e ntle PCB boto Thehiloe ho boiphihlelo rona tse fetileng, re rata ho bua ka maikutlo a rōna ka likarolo tse latelang:
1. Hlalosa lipakane tsa hao
O ile a fumana moralo mosebetsi, lokela ho qala ka hleka lipakane tseo moralo, ke e Tloaelehileng PCB boto , bo phahameng maqhubu PCB , tse nyenyane pontšo sebetsa PCB kapa ho na le bobeli maqhubu a phahameng le tse nyenyane pontšo sebetsa PCB, haeba ke PCB neng li tloaelehile , ka nako e telele e le ho etsa moralo le kahlolo e molemo le tlwaetso ya ho hlwekisa, phetha molao boholo e nepahetseng, ha mola mojaro le mola telele, e tla sebetsoa ka mokhoa itseng, fokotsa boima mojaro, ho matlafatsa moleng telele tsa ka koloi, e leng ea bohlokoa ke ho thibela ponahatso moleng telele e. Ha ho na le tse fetang mela 40MHz pontšo boto ya, nahanelwa khethehileng li etsetsoang e le mela tsena pontšo, tse kang crosstalk.If maqhubu e phahameng, na lithibelo tse eketsehileng mabapi le bolelele ba wiring, ho ea ka entsprechen kabo ea khopolo marangrang, le sebelisana pakeng tsa balebeli ba potoloho phahameng lebelo le kamano lona ke ntlha ea bohlokoa, tsamaiso ke ke ba hlokomoloha ka design.With ho ntlafatso ya monyako lebelo phetiso, ka mola khahlanong le tla eketseha, ho crosstalk pakeng tsa mela haufi pontšo e tla tekanyo e lekanang ya ho eketseha, hangata e phahameng-lebelo tshebediso ya matla le mocheso dissipation ba balebeli ba potoloho ba e kholo haholo, ba lokela ho etsa hore re lebise tlhokomelo e lekaneng ea ha etsa phahameng-lebelo PCB.
Ha boto na boemo ba millivolt esita microvolt boemo ba ha pontšo fokolang, le pontšo e tla hloka tlhokomelo e khethehileng, tse nyenyane pontšo e fokola haholo, ba tlokotsing haholo ho ba bang a matla tshitsiso pontšo, e sireletsoe mehato hangata hlokahala, ho seng joalo e tla haholo fokotsa pontšo-to-lerata matšoao ratio.So hore e molemo ba khangoa ke metsi ka ntle ke lerata le ke ke ka tsela e atlehang ntšitsoeng.
Ka boto tekanyo hape ba lokela ho ho nkoa ka nahanela nakong ea mohato moralo, lefelo meleng lintlha teko, teko ntlha ya lintlha ho itšehla thajana ke ke ba hlokomoloha, hobane tse ling tsa pontšo e nyenyane 'me e phahameng maqhubu a pontšo e sa ka ho toba eketsa fatang ho lekanya.
Ho phaella moo, ho na le lintho tse ling tse amanang, tse kang lera ea mapolanka, ho sephutheloana sebopeho ea likarolo ho le phetha molao matla tsa boards.Before etsang mapolanka PCB, o lokela ho ba le moralo pakane e ka kelello.
2. Utloisisa ditlhoko tsa mosebetsi ea likarolo ho sebelisoa ka moralo wa
Ha re ntse re tseba, ho na le ba bang ba metsoako e khethehileng ka moralo wa di ditlhoko khethehileng, tse kang LOTI le APH sebediswa analoge pontšo seholisa, analoge pontšo seholisa bakeng hlokahalang matla bakeng sa le boreleli, tse nyenyane ripple.The ketsiso tsa likarolo tse nyenyane pontšo lokela ho a 'na a tloha ho matla devices.On boto OTI, ba banyenyane pontšo kholiso karolo e hape ho khethehileng etselitsoe ka u sireletse maske ho sireletsa ho itaola motlakase interference.GLINK dita le sebelisitsoe ka boto NTOI ke ECL thulaganyong, tshebediso ya matla kholo feberu, ho bothata ea mocheso dissipation lokela ho etswa ha moralo tlameha ho khethehileng ho nahanela, haeba tsidifatso tsa tlhaho, o tla beha GLINK ladica i ka phallo moea ke le boreleli, le ntle ea mocheso ha le tšusumetso e khōlō ho ba bang chips.If ho na le lenaka le kapa tse ling tse phahameng matla sesebediswa palame sekepe seo, ho ka 'na e boetse e etsa hore tšilafalo e tebileng ea matla eo ho lokelang hape ela hloko ka ho lekaneng.
3. Nahanela ba moralo motsoako
The moralo oa dikarolo pele lebaka le leng ho nahana ka ke tshebetso, haufi-ufi amanang ho mabapi ea likarolo hammoho ho ea fihla kamoo ho ka khonehang, haholo-holo bakeng sa ba bang moleng phahameng lebelo, le moralo ke ho etsa hore ho e le lekgutshwanyane kamoo ho ka khonehang ea ho arohana matla pontšo le tse nyenyane bontša device.In le tlhagisa ntlha ea pokano tshebetso ya oa potoloho, ke e boetse e ho hlokahala hore ho nahana ka tokisetso ea metsoako e le hore, ntle, e bonolo ea ho hlahloba, ho phetha molao boholo ba boto e, boemo ba soketeng e, joalo-joalo
Phetiso lieha nako ya hexagon le interconnection tsamaisong phahameng-lebelo ke e boetse e le Ntho e ba pele ba ho ho hopolwa ha ho qapa le system.Signal ka nako phetiso ne le tšusumetso e matla ka kakaretso oona tsamaisong lebelo, haholo-holo bakeng sa phahameng-lebelo ECL lipotoloho, le hoja phahameng lebelo setshehetso sa balebeli ba potoloho le literata ka boeona e, empa ka lebaka la ho fatse le sebolokigolo neng li tloaelehile (mong le e mong cm, 30 e telele, ka ho tšenyo ea nako ba NS 2) tlisa ho eketseha ha nako e lieha, ka ho etsa tsamaiso ea lebelo e fokotsehile haholo. Joaloka battlefield ngolisa, synchronous stats kahamahanyo ena sebetsa likarolo ka sengoathoana o tšoanang oa ho karete, best hobane ba fapaneng phetiso lieha nako ea oache pontšo boto e sa lekane, ka etsa hore motho a battlefield a 'ngolise liphoso lihlahisoa, haeba e se ka poleiti, moo kahamahanyo ke senotlolo, ho tloha oache ea sechaba mohloding amanang ho moleng oache lokela ho lekana le bolelele ba boto ena.
4. Nahanela ba wiring
Le moralo oa OTNI le naleli marangrang Optical le litlheferetsi, tse fetang 100MHz ya mola phahameng lebelo pontšo e tla hloka ho etselitsoeng nakong e tlang. Ba bang ba dikgopolo tse go motheo ea mola phahameng lebelo tla hlahiswa mona.
phetiso ea mola
Leha e le efe "nako e telele" bontša tseleng ka hatisitsoeng oa potoloho botoka nkoa phetiso ya line.If phetiso lieha ya mohala e khutšoanyane haholo ho feta pontšo phahama nako, ho bontša mong'a nakong eketseha pontšo e tla submerged.No sa hlahella overshoot, monahano o le ringing, bakeng sa ka nako eo, boholo ba MOS oa potoloho, ka lebaka la ho phahama nako ya mola phetiso lieha nako e batlang e le kholoanyane haholo, kahoo ho ka ba ka limithara tse telele 'me ha ho na distortion.And pontšo bakeng sa lipotoloho kapele sea utloahala kapa che, haholo-holo marang-phahameng lebelo ECL.
Tabeng ea lipotoloho kopantswe, bolelele ba mesaletsa ea tlameha ho haholo shortened e le hore ho boloka botšepehi ba pontšo le ka lebaka la ho lebelo ka lebelo bohale.
Ho na le ditsela tse pedi tsa ho etsa se phahameng-lebelo oa potoloho ka e batlang e le nako e telele mola mosebetsi ntle ho khopama tebileng, e sebediswa bakeng sa ho fokotseha ka potlako bohale TTL schottky diode clamping mokhoa, ho etsa tšusumetso e tsoang ho ba ho ithiba ka diode ke ka tlaase ho feta fatše 'nang lerotholi khatello ea ka boemo ba fokotsa monahano o ka morao ea molumo, e leng butle bohale bochaba-overshoot e lumelloa, empa ke boemo ba "H" ka boemo ba batlang e phahameng khumo impedance ba balebeli ba potoloho ba (50 ~ 80 Ω) attenuation .In ho phaella moo, ka lebaka la boemo ba "H" boemo maloetseng, kholoanyane le monahano bothata hase e ikhethang haholo, sesebediswa sa HCT letoto la lihlooho tse, haeba o sebedisa schottky diode clamping le letoto la lihlooho tse ho hanyetsa lehlakoreng amahanya mokhoa, phello e ntlafetseng ya tla totobetse le ho feta.
Ha ho na le Fan ea ho tsoa hammoho moleng pontšo, ho TTL itseng ho laoleng mokhoa hlalositsoeng ka holimo a haelloa ka tekanyo e phahameng batla a le kapele bohale speed.Because na ba bonahatsa maqhubu mocheng, ba ile ba tla ba le tšekamelo ea ho ho tsa maiketsetso ka tekanyo e phahameng, e leng se etsa hore ho khopama e tebileng ea pontšo le fokotseha-ba khahlanong le tshitsiso ability.Therefore, e le hore ho rarolla bothata ba ponahatso, mokhoa o mong e hangata sebelisoa ka tsamaiso ea ECL: mola impedance matching method.In tsela ena ponahatso e laoloang le botšepehi ba pontšo e Guaranteed.