Ramin-rami da kansa yana da capacitance parasitic zuwa ƙasa. Idan diamita na keɓe rami a ƙasa Layer na ta-rami da aka sani da zama D2, diamita na ta-rami kushin ne D1, da kauri daga cikin PCB hukumar ne T, da dielectric akai na hukumar substrate. is ε, The parasitic capacitance na via ne kamar C=1.41 ε TD1/(D2-D1)
Babban tasirin tasirin parasitic akan da'irar da ta hanyar vias shine cewa yana tsawaita lokacin siginar kuma yana rage saurin da'ira. Misali, ga allon PCB mai kauri na Mil 50, idan aka yi amfani da vias mai diamita na ciki Mil 10 da diamita na kushin Mil 20, kuma tazarar da ke tsakanin kushin da yankin tagulla a ƙasa shine Mil 32. , za mu iya kusan lissafin parasitic capacitance na vias ta yin amfani da dabarar da ke sama kamar haka: C=1.41 x 4.4x 0.050 x 0.020/(0.032-0.020)=0.517pF, Bambancin lokacin tashi da wannan karfin shine: T10-90 =2.2C (Z0/2)=2.2x0.517x (55/2)=31.28ps. Daga waɗannan dabi'u, ana iya ganin cewa ko da yake ƙarfin parasitic na guda ɗaya bazai yi tasiri mai mahimmanci wajen rage hawan hawan ba, ya kamata a yi taka tsantsan idan an yi amfani da vias sau da yawa a cikin wayoyi don sauyawar interlayer.
Tare da ikon parasitic a cikin ta, akwai kuma inductance parasitic. Inductance na parasitic jerin inductance yana raunana gudummawar ƙarfin kewayawa kuma yana raunana tasirin tacewa na dukkan tsarin wutar lantarki. Ana iya amfani da dabarar da ke gaba don ƙididdige ƙididdigewa na inductance na parasitic a cikin ta:
L=5.08h [ln (4h/d)+1], inda L ke nufin inductance ta rami, h shine tsayin ramin, kuma d shine diamita na rami na tsakiya. Daga ma'auni, ana iya ganin cewa diamita na via yana da ƙananan tasiri akan inductance, yayin da tsayin daka yana da tasiri mafi girma a kan inductance. Yin amfani da misalin da ke sama, ana iya ƙididdige inductance ta hanyar azaman L=5.08x0.050 [ln (4x0.050/0.010)+1]=1.015nH. Idan lokacin tashin siginar ya kasance 1ns, to daidai girman girmansa shine: XL=π L/T10-90=3.19 Ω.
A takaice:
Zaɓin PCB mai ƙaranci yana da fa'ida don rage sigogin parasitic
Gwada kar a canza yadudduka ko amfani da ta hanyar da ba dole ba don sigina
Hana ramuka kusa da samar da wutar lantarki da ƙasa, kuma mafi guntu da mafi kauri na wayoyi na ramukan da fil, mafi kyau
Sanya ƙarin ramukan ƙasa kusa da siginar sauya siginar don samar da mafi kusa da siginar
Lokacin yin jerin samfuran fiber na gani, kamar modul na gani,ONU, Optical fiber module,OLTmodule, da dai sauransu, dole ne ka yi la'akari da tasirin vias a kan bosa, watsa hoton ido, raƙuman ɓarna, da sauransu, ko tasirin karɓar hankali.
Abin da ke sama taƙaitaccen bayani ne na "Gabatarwa ga Maɓallin Maɓalli na BOSA - ta hanyar girman (II)", wanda za'a iya amfani dashi azaman tunani. Kamfaninmu yana da ƙungiyar fasaha mai ƙarfi kuma yana iya samar da sabis na fasaha na ƙwararrun abokan ciniki. A halin yanzu, kamfaninmu yana da samfura daban-daban: masu hankaliwani, sadarwa Tantancewar module, Tantancewar fiber module, sfp Tantancewar module,oltkayan aiki, Ethernetcanzada sauran kayan aikin sadarwa. Idan kuna buƙata, kuna iya ƙarin koyo game da su.
