The through-hole ka boeona e na le parasitic capacitance fatše.Haeba bophara ba lesoba la ho itšehla thajana mokatong oa mokato oa lesoba le tsejoa e le D2, bophara ba sekoti se phunyeletsang ke D1, botenya ba boto ea PCB ke T, le dielectric constant tsa substrate ea boto. ke ε, The parasitic capacitance of the via is almost C=1.41 ε TD1/(D2-D1)
Tšusumetso e kholo ea capacitance ea parasitic ka potoloho e bakoang ke vias ke hore e lelefatsa nako ea pontšo le ho fokotsa lebelo la potoloho.Ka mohlala, bakeng sa boto ea PCB e nang le botenya ba 50 Mil, haeba ho sebelisoa vias e nang le bophara bo ka hare ba 10 Mil le bophara ba pad ea 20 Mil, 'me sebaka se pakeng tsa pad le sebaka sa koporo fatše ke 32 Mil. , hoo e ka bang re ka bala capacitance ea parasitic ea vias ho sebelisa mokhoa o ka holimo ka tsela e latelang: C=1.41 x 4.4x 0.050 x 0.020/(0.032-0.020)=0.517pF, Phapang ea nako ea ho phahama e bakoang ke bokhoni bona ke: T10-90 =2.2C (Z0/2)=2.2x0.517x (55/2)=31.28ps.Ho tswa ho makgabane ana, ho ka bonoa hore le hoja capacitance parasitic ea ka tsela e le 'ngoe ka 'na ha se na phello e khōlō ho fokotsa lebelo ho phahama, ho lokela ho ba hlokolosi haeba vias sebelisoa makhetlo a mangata ka wiring bakeng sa interlayer switjha.
Hammoho le capacitance parasitic ka via, ho boetse ho na le parasitic inductance.The parasitic series inductance fokolisa monehelo oa bypass capacitance le ho fokolisa katleho ea ho sefa ea tsamaiso eohle ea matla.Foromo e latelang e ka sebelisoa ho bala feela khakanyo ea inductance ea parasitic ka tsela e latelang:
L=5.08h [ln (4h/d)+1], moo L e buang ka ho phunyeha ha lesoba, h ke bolelele ba lesoba, 'me d ke bophara ba lesoba le bohareng la ho cheka.Ho tloha ho equation, ho ka bonoa hore bophara ba via bo na le tšusumetso e nyane ho inductance, athe bolelele ba via bo na le tšusumetso e kholo ho inductance.Ho sebelisa mohlala o ka holimo, inductance ea via e ka baloa e le L=5.08x0.050 [ln (4x0.050/0.010)+1]=1.015nH.Haeba nako ea ho phahama ha lets'oao ke 1ns, joale boholo ba eona bo lekanang ba impedance ke: XL=π L/T10-90=3.19 Ω.
Ka kakaretso:
Ho khetha PCB e tšesaane ho na le molemo bakeng sa ho fokotsa parasitic parameters
Leka ho se fetole mekhahlelo kapa ho sebelisa li-vias tse sa hlokahaleng bakeng sa ho tsamaisa mats'oao
Cheka masoba haufi le phepelo ea motlakase le fatše, 'me ha likhoele tsa masoba le likhoele li le khuts'oanyane le ho feta, ho ba betere.
Beha likoti tse ling tsa fatše haufi le lera la ho fetola letšoao ho fana ka potoloho e haufi haholo bakeng sa lets'oao
Ha o etsa letoto la lihlahisoa tsa fiber optical, joalo ka optical module,ONU, optical fiber module, OLT module, joalo-joalo, o tlameha ho nahana ka phello ea vias ho bosa, setšoantšo sa mahlo se fetisang, tekanyo ea ho timela, joalo-joalo, kapa phello ea ho amohela kutloisiso.
Lintlha tse ka holimo ke tlhaloso e khutšoanyane ea "Selelekela ho Li-Parameters tsa Bohlokoa tsa BOSA - ka boholo (II)", e ka sebelisoang e le boitsebiso.Khamphani ea rona e na le sehlopha se matla sa tekheniki mme se ka fana ka lits'ebeletso tsa botekgeniki ho bareki.Hajoale, k'hamphani ea rona e na le lihlahisoa tse fapaneng: tse bohlaleonu, puisano ea optical module, optical fiber module, sfp optical module, lisebelisoa tsa olt, Ethernet switch le lisebelisoa tse ling tsa marang-rang.Haeba u hloka, u ka ithuta ho eketsehileng ka tsona.
