6 Layer FR4 ENIG Impedance Control PCB
Nā mea e hoʻoholo ai i ka Impedance i hoʻomaluʻia
Hoʻoholo pinepine ʻia ka impedance hiʻohiʻona o kahi PCB e kona inductance a me ka capacitance, kūpaʻa a me ka conductance.ʻO kēia mau mea nā hana o ka nui kino o ke kaapuni, ka dielectric mau a me ka mānoanoa dielectric o ka mea PCB substrate.Ma ka laulā, ʻo ka laina impedance o kahi PCB mai 25 a 125Ω.ʻO ka ʻōnaehana PCB e hoʻoholo ai i ka waiwai impedance e pili ana i kēia mau mea:
ʻO ka laulā a me ka mānoanoa o nā laina hōʻailona keleawe ma luna a ma lalo
Ka laula o na uwea keleawe o luna a me lalo.ʻO ke kaʻina hana o loko o ka ʻaha a me ke kaapuni ʻo 0.5oz 3/3mil a 6oz 15/12mil laina hōʻailona keleawe, a ʻokoʻa ka mamao o waho mai 1/3oz 3/3mil a 6oz 15/12mil.
ʻO ka pā kumu a i ʻole ka mānoanoa pepa semi-cured ma nā ʻaoʻao ʻelua o ka uea keleawe
Hoʻohana ʻia ka pepa semi-cured ma ke ʻano he papa hoʻopaʻa e paʻa i nā papa kumu āpau i kahi PCB.I ka hoʻolālā ʻana i ka PCB mana impedance, e like ka mānoanoa o ka pepa semi-cured ma nā ʻaoʻao ʻelua o ka papa kumu.
Dielectric mau o ka PCB kumu a me ka pepa semi-cured
Inā ʻokoʻa ka hoʻomau dielectric o ka pā kumu a me ka pepa semi-cured, e loli pū ka impedance.No laila, pono e like ka mau dielectric o nā mea ʻelua.