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 poari PCB kore ko te mea ohie.
E rua uauatanga nui i roto i te mara o Microelectronics ko te tohu auau tiketike, me te tukatuka tohu ngoikore, production PCB he tino nui te faatura tenei i roto i te taumata, te hoahoa parau tumu taua, te taua wāhanga, iwi rerekē i hanga e whai hua rerekē PCB, na me pehea ki te hanga i ? te poari PCB pai i runga i to tatou wheako o mua, e hiahia ana matou ki te matapaki i to tatou whakaaro i runga i te āhuatanga e whai ake nei:
1. Whakatautuhia koutou whāinga
Riro mai te mahi hoahoa, me te tuatahi ūkui i te whāinga hoahoa, ko te poari PCB Common , PCB nui-auau , PCB tukatuka tohu iti ranei i reira e rua auau tiketike, me te tukatuka tohu iti o te PCB, ki te he te reira i te PCB noa , kia rite ki te roa rite te mahi tahora whaitake, me te whakapaipai, te rahi aunoa tika, ki te, ka kia whawha te aho kawenga me te aho roa e te tetahi tikanga, e whakamama te kawenga, ki te whakapakari i te rārangi roa o te puku, te kī, ko te ki te ārai i whakaaro te raina o te roa. a, no te reira neke atu i ngā rārangi tohu 40MHz i runga i te poari e, e hanga whakaaro motuhake mo enei raina tohu, pērā i te mea teitei crosstalk.If auau, i atu here i runga i te roa o te waea, kia rite ki nga tawhā tohatoha o ariā whatunga, te taunekeneke i waenganui i taiawhio tere tiketike, me tona tāpiritanga ko te take papau, e kore e taea te waiho te pūnaha i design.With te whakapai ake o te tere tuku tatau, i runga i te raina ki ka nui ake, te crosstalk i waenganui i ngā rārangi tohu pātata ka waiho hautanga ki te hua i roto i, te tikanga nui-tere te mana kohi me te toreretanga o te ara iahiko wera ko te tino nui, kia meinga nui whakarongo ina mahi nui-tere PCB.
A, no te whai te poari taumata millivolt noa taumata microvolt ka, ka hiahia te tohu te tohu ngoikore tiaki motuhake, tohu iti he ngoikore rawa, rawa whakaraerae ki ētahi atu whakararu tohu kaha, paruru mehua he maha e tika ana, te kore e nui whakaiti i te tohu-ki-haruru toremi iho tohu ratio.So e whai hua i roto i na roto i te haruru, a taea kore te tōtika tangohia.
I te poari hoki kia tangohia te mehua ki whakaaro i roto i te wā hoahoa, te wāhi tinana o ngā whakamātautau, ka taea e kore e waiho te ira whakamātautau o ngā āhuatanga taratahi, no etahi o te tohu iti, me te auau teitei tohu kore te tika tāpiri uiuia ki te ine i.
I tua atu, i reira e te tahi atu āhuatanga e pā ana, pērā i te papanga o papa, te āhua mōkihi o nga wāhanga me te kaha pūkaha o te hanga papa PCB boards.Before, kia whai koe i te whāinga hoahoa i roto i te ngakau.
2. Mahino nga whakaritenga o te mahi o te wāhanga e whakamahia ana i roto i te tahora
Ka rite ki matau ana tatou, i reira e te tahi mau wāhanga motuhake i roto i te tahora i ngā whakaritenga motuhake, pērā i tuwha atu ko APH whakamahia tīwerawera tohu tairitenga, tīwerawera tohu tairitenga mō te mana whakaritenga mo te maheni, whaihanga ripple.The iti o ngā wāhanga tohu iti kia puritia atu i te kaha devices.On te poari Oti, kei te hoki i āta hangaia te wahi tohu amplification iti ki te kanohi hipoki ki te whakangungu rakau, i te kotiti maramara interference.GLINK hiko whakamahia i roto i te poari NTOI ko te tukanga ECL, te mana kohi nui kirika, ki te raruraru o te tohanga wera me whakahaere ina kia te tahora whakaaro motuhake, ki te te tautauā tūturu, ka hoatu te maramara GLINK i rere o te hau he maheni, a kahore he he pānga nui ki ētahi atu chips.If reira ko te haona ranei atu mana nui i roto i o te wera pūrere i runga i te poari, kia meinga hoki reira poke nui o te mana e hoki utu reira nui aro.
3. whakaaro o te tahora wae
Ko te tahora o te wāhanga tuatahi kotahi take ki te whakaaro ko te mahi, e pā ana tata ki te hononga o ngā wāhanga tahi tae noa ki taea, rawa hoki etahi raina tere tiketike, ko te tahora he ki te hanga i te reira kia rite ki poto rite taea ki te wehe te mana tohu, me te iti tohu device.In te kōhanga o te whakaminenga i te mahi o te ara iahiko, he tika ano hoki reira ki te whakaaro i te whakaritenga o te wāhanga i roto i te tikanga, ataahua, kia watea whakamatautau, te rahi pūkaha o te poari, te tūranga o te ateatenga, me ētahi atu
Ko hoki te wa tuku roa o te uhupoho me ngatahi i roto i te pūnaha nui-tere te take tuatahi ki te kia whakaaro ina hoahoa te system.Signal i te wa tuku i te mana nui i runga i te tere pūnaha whānui, rawa hoki tiketike-tere ECL iahiko, ahakoa te tere tiketike integrated poraka ara iahiko iho, engari kia rite ki te hua o runga i te papa ki whātuitui noa (nga 30 cm te roa, e pā ana ki te roa o te 2 ns) kawea te hua o te wa roa, ka taea e hanga te nui heke te tere pūnaha. Ka rite ki te rēhita neke, counter tukutahinga tenei tukutahi mahi wāhanga i runga i te wahi kotahi o te kāri, e kore e taurite pai hoki o te wa tuku roa rerekē o te tohu karaka i runga i te poari, i taea e arahi ki te hapa hua rēhita neke, ki te kahore i runga i te me kia pereti, kei hea tukutahitanga ko te kī, i te puna karaka tūmatanui hono ki te raina karaka rite ki te roa o te papa.
4. whakaaro o te waea
Ki te hoahoa o OTNI me whetu whatunga muka whatu, neke atu i te 100MHz o te raina tohu tere tiketike e hiahia ki te kia hangaia i roto i te heke mai. Ka ētahi ariā taketake o te aho tere tiketike kia whakaurua i konei.
raina tuku
Tetahi "roa" kïia e ara i runga i te tāngia poari ara iahikotaea te whakaaro te tuku line.If he nui poto atu i te wa tohu ara te roa tuku o te aho, ka hei te whakaata o te rangatira i roto i te tohu ara submerged.No roa puta overshoot, utu te, me te waea, hoki i te kau, ko te nui nui te nuinga o te ara iahiko Mos, no te mea o te wa ara o te tuku raina wā roa, kia taea e te reira i roto i mita te roa, me kore distortion.And tohu mo tere iahiko arorau, rawa ultra-tiketike tere ECL.
I roto i te take o iahiko integrated, me tino poroa te roa o te tohu i roto i te tikanga ki te mau tonu i te tapatahi o te tohu e tika ana ki tere tere mata.
E rua ngā huarahi ki te hanga i te ara iahiko nui-tere i roto i te mahi rārangi āhua roa kahore distortion nui, kua whakamahia hoki te heke tere i roto i te mata TTL schottky ngōhiko clamping tikanga, kia hihiko kia he whitiki i roto i te ngōhiko ko raro atu i te whenua te maturuturunga iho pēhanga pea i runga i te taumata o te whakaiti i te mui i te hoki o te kaha tīwera, te whakaaetia te pōturi te mata aranga o te overshoot, engari ko reira taumata "H" i roto i te āhua o te putanga āhua nui parenga ia o te ara iahiko (50 ~ 80 Ω) attenuation .I te tua, e tika ana ki te taumata o te wātea i te mate kāwanatanga "H", e kore he tino tino nui raruraru utu te, pūrere o raupapa HCT, ki te whakamahi i schottky ngōhiko clamping me raupapa taha ātete hono te tikanga, ka waiho atu kitea te pānga ake.
A, no te reira te mea he mea powhiriwhiri i haere te aho tohu, kei te ngaro te tikanga auaha TTL whakaahuatia ana i runga i roto i te auau moka teitei me te mata tere speed.Because reira e kitea ngaru i te aho, ka ahu ratou ki te kia synthesized i te auau tiketike, ko te kupu meinga distortion nui o te tohu, me te heke anti-pokanoa ability.Therefore, i roto i te tikanga ki te whakaoti i te raruraru whakaata, kei te nuinga o te wā e whakamahia ana tetahi tikanga i roto i te pūnaha ECL: parenga ia raina ōrite method.In tenei ara whakahaere te whakaata kei te me te tapatahi o te whai tohu te.