ʻO ka ʻenehana maikaʻi loa kekahi o nā mea hana pcb maikaʻi loa a me nā mea hoʻolako papa kaapuni paʻi ma Kina
ʻLelo
ʻO ka ʻenehana maikaʻi loa kekahi o nā mea hana pcb maikaʻi loa a me nā mea hoʻolako papa kaapuni paʻi ma Kina
Ua lilo nā kaapuni rigid-flex i mea kaulana i nā makahiki i hala iho nei ma muli o ka hoʻohui ʻana i ka maʻalahi o nā kaʻa a me ka rigidity.& hilinaʻi o FR4 PCB. ʻO kekahi o nā manaʻo hoʻolālā koʻikoʻi i ka wā e hana ai i kahi kaapuni rigid-flex ka waiwai impedance. No nā hōʻailona maʻamau kiʻekiʻe a me nā kaapuni RF, ʻo 50ohm kahi waiwai maʻamau i hoʻohana ʻia e nā mea hoʻolālā a me nā mea hana, no ke aha e koho ai i 50ohm? Loaʻa ka 30ohm a i ʻole 80ohm? I kēia lā, e ʻimi mākou i nā kumu o ka impedance 50ohm ka koho hoʻolālā maikaʻi loa no nā kaʻa kaʻa-flex.
He aha ka Impedance a no ke aha he mea nui?
ʻO ka Impedance kahi ana o ke kū'ē i ke kahe o ka ikehu uila i loko o kahi kaapuni, i hōʻike ʻia ma Ohms a hana i kahi mea koʻikoʻi i ka hoʻolālā ʻana o nā kaapuni. E pili ana i ka impedance hiʻona o ka trace transmission, ʻo ia ka waiwai impedance o ka hawewe electromagnetic i ka wā e hoʻouna ana i ka trace / uea, a pili i ke ʻano geometric o ka trace, ka mea dielectric a me ke kaiapuni a puni o ka trace. Hiki iā mākou ke ʻōlelo, pili ka impedance i ka maikaʻi o ka hoʻololi ʻana o ka ikehu a me ka hana holoʻokoʻa o ke kaapuni.
50ohm Impedance no nā Kaapuni Rigid-Flex
Aia kekahi mau kumu no ke kumu he 50ohm impedance ka koho hoʻolālā maikaʻi loa no nā kaapuni paʻa-flex.
1. ʻO ka waiwai maʻamau a me ka paʻamau i ʻae ʻia e JAN
I ka wā o ke Kaua Honua II, ua hilinaʻi loa ke koho impedance i ka pono o ka hoʻohana ʻana, a ʻaʻohe waiwai maʻamau. Akā i ka holomua ʻana o ka ʻenehana, pono e hāʻawi ʻia nā kūlana impedance i mea e paʻa ai ke kaulike ma waena o ka hoʻokele waiwai a me ka maʻalahi. No laila, ua koho ka JAN Organization (Joint Army Navy), kahi hui hui o ka pūʻali koa ʻAmelika Hui Pū ʻIa, i ka 50ohm impedance ma ke ʻano he kumu maʻamau maʻamau no ka noʻonoʻo ʻana i ka hoʻohālikelike ʻana i ka impedance, ka hoʻopaʻa ʻana i ka hōʻailona a me ka pale ʻana i ka hōʻailona. Mai ia manawa, ua ulu ka 50ohm impedance i ka pae honua.
2. Hoʻonui i ka hana
Mai ka manaʻo hoʻolālā PCB, ma lalo o ka 50ohm impedance, hiki ke hoʻouna ʻia ka hōʻailona ma ka mana kiʻekiʻe i ke kaapuni, no laila e hōʻemi ana i ka attenuation hōʻailona a me ka noʻonoʻo. I kēia manawa, ʻo 50ohm ka mea maʻamau i hoʻohana ʻia i ka impedance input antenna i nā kamaʻilio kelepona.
Ma ka ʻōlelo maʻamau, ʻoi aku ka maikaʻi o ka impedance haʻahaʻa, ʻoi aku ka maikaʻi o ka hana o nā traces transmission. No ka hoʻouna ʻana me ka laula laina i hāʻawi ʻia, ʻoi aku ka kokoke i ka mokulele honua, e emi ana ka EMI (Electro Magnetic Interference) e pili ana, a e emi pū ka crosstalk. Akā, mai ka manaʻo o ke ala holoʻokoʻa o ka hōʻailona, pili ka impedance i ka hiki ke hoʻokele o nā chips - ʻaʻole hiki i ka hapa nui o nā pahu mua a i ʻole nā mea hoʻokele ke hoʻokele i ka laina hoʻouna ma lalo o 50ohm, ʻoiai ʻo ka laina hoʻouna kiʻekiʻe he paʻakikī ke hoʻokō a ʻaʻole. hana pū kekahi, no laila, ʻo ka hoʻohālikelike ʻana o 50ohm impedance ke koho maikaʻi loa i kēlā manawa.
3. Hoʻolālā maʻalahi
I ka hoʻolālā PCB, pono mau e hoʻohālikelike me ka laina laina a me ka laulā e hōʻemi i ka noʻonoʻo hōʻailona a me ka crosstalk. No laila, i ka hoʻolālā ʻana i nā traces, e helu mākou i kahi waihona no kā mākou papahana, e like me ka mānoanoa, substrate, nā papa a me nā ʻāpana ʻē aʻe e helu ai i ka impedance, e like me ka pakuhi ma lalo.
Wahi a kā mākou ʻike, ua maʻalahi ka 50ohm i ka hoʻolālā ʻana i ka hoʻopaʻa ʻana, ʻo ia ke kumu i hoʻohana nui ʻia ai i nā ʻoihana uila.
4. E maʻalahi a maʻalahi ka hana
Ke noʻonoʻo nei i nā mea hana o ka hapa nui o nā mea hana PCB, he mea maʻalahi ke hana i ka 50ohm impedance PCB.
E like me kā mākou e ʻike ai, pono e hoʻohālikelike ka impedance haʻahaʻa i ka laulā laina ākea a me ka medium lahilahi a i ʻole ka nui dielectric mau, he paʻakikī ke hālāwai ʻana ma kahi ākea no nā papa kaapuni kiʻekiʻe kiʻekiʻe o kēia manawa. ʻOiai ʻo ka impedance kiʻekiʻe e pono ai ka laulā laina ʻoi aku ka mānoanoa a i ʻole ka liʻiliʻi liʻiliʻi dielectric mau, ʻaʻole ia he conductive no ka EMI a me ka crosstalk suppression, a ʻo ka hilinaʻi o ka hana ʻana e ʻilihune no nā kaapuni multilayer a mai ka manaʻo o ka hana nui.
Manaʻo i ka 50ohm impedance i ka hoʻohana ʻana i ka substrate maʻamau (FR4, etc.) a me ke kumu maʻamau, ka hana ʻana o ka mānoanoa papa maʻamau e like me 1mm, 1.2mm, hiki ke hoʻolālā ʻia ka laulā laina maʻamau o 4 ~ 10mil, no laila ua maʻalahi ka hana ʻana, aʻo ka hanaʻana i nā mea hanaʻaʻole ia he koi kiʻekiʻe loa.
5. Hoʻohālikelike me nā hōʻailona High-Frequency
Nui nā kūlana a me nā mea hana hana no nā papa kaapuni, nā mea hoʻohui, a me nā kaula i hoʻolālā ʻia no 50ohm impedance, no laila e hoʻohana ana i ka 50ohm e hoʻomaikaʻi i ka hoʻohālikelike ʻana ma waena o nā mea hana.
6. Kūʻai-pono
ʻO ka 50ohm impedance kahi koho waiwai a maikaʻi loa i ka wā e noʻonoʻo ai i ke kaulike ma waena o ke kumukūʻai hana a me ka hana hōʻailona.
Me kāna mau hiʻohiʻona paʻa paʻa a me ka helu haʻahaʻa haʻahaʻa haʻahaʻa, hoʻohana nui ʻia ka 50ohm impedance i nā kahua he nui, e like me nā hōʻailona wikiō, nā kamaʻilio data kiʻekiʻe, etc. Eia naʻe, he mea nui e hoʻomaopopo, ʻoiai ʻo 50ohm kekahi o nā impedances maʻamau i hoʻohana ʻia i ka ʻenekini uila, i kekahi mau noi, e like me ke alapine o ka lekiō, pono paha nā waiwai impedance e hoʻokō i nā koi kikoʻī. No laila, i ka hoʻolālā kikoʻī, pono mākou e koho i ka waiwai impedance kūpono e like me ke kūlana maoli.
Loaʻa i ka ʻenehana maikaʻi loa ka ʻike hana hana ma ka papa kaapuni paʻa paʻa, ʻo kēlā me kēia papa hoʻokahi, papa pālua a i ʻole FPC multi-layer. Eia hou, hāʻawi ʻo Best Tech i ka FR4 PCB (a hiki i 32layers), metala PCB, ceramic PCB a me kekahi PCB kūikawā e like me RF PCB, HDI PCB, ʻoi aku ka lahilahi a me ke kaumaha keleawe PCB. Welina mai e leka uila iā mākou inā he nīnau kāu PCB.
