Hei whakarite i te kounga o te tuku tohu, whakaitihia te wawaotanga o te EMI, me te tuku i te tiwhikete whakamatautau impedance e tika ana, PCB e hiahiatia ana te hoahoa orite impedance tohu matua. Ko tenei aratohu hoahoa kei runga i nga tawhā tatauranga noa, nga tohu tohu hua TV, nga whakaritenga PCB Tahora, te tatauranga rorohiko SI9000, nga korero urupare a te kaiwhakarato PCB me etahi atu, ka tae mai ki te hoahoa kua tohua. E tika ana mo te nuinga o nga paerewa tukanga o nga kaiwhakarato PCB me nga hoahoa papa PCB me nga whakaritenga mana aukati.

Kotahi. Te hoahoa impedance papa rua

① Hoahoa whenua: whanui raina, mokowā 7/5/7mil waea whenua whanui ≥20mil tohu me te waea whenua tawhiti 6mil, ia 400mil poka whenua; (2) Hoahoa-kore: te whanui o te raina, te mokowhiti 10/5/10mil takirua rereke me te tawhiti i waenga i te takirua ≥20mil (kaore e taea te iti iho i te 10mil nga ahuatanga motuhake) e taunaki ana kia whakamahia e te roopu katoa o te raina tohu rereke te whakamahi i te kopaki. te whakamarumaru, te tohu rereke me te whakamarumaru i te tawhiti whenua ≥35mil (kaore e taea te iti iho i te 20mil nga ahuatanga motuhake). 90 ohm impedance pārōnaki hoahoa tūtohutia

Te whanui o te raina, te mokowhiti 10/5/10mil Te whanui waea whenua ≥20mil Te tohu me te tawhiti waea whenua o 6mil ranei 5mil, poka whenua ia 400mil; ②Kaua e whakauruhia te hoahoa:

Ko te whanui o te raina me te mokowhiti 16/5/16mil te tawhiti i waenga i te takirua tohu rereke ≥20mil e taunaki ana kia whakamahia te kopaki whenua mo te roopu katoa o nga taura tohu rereke. Ko te tawhiti i waenga i te tohu rereke me te taura whenua whakamarumaru me ≥35mil (he ≥20mil ranei i roto i nga keehi motuhake). Ko nga kaupapa matua: hoatu te kaupapa matua ki te whakamahi i te hoahoa whenua kua hipokina, ka taea te whakamahi i te raina poto me te rererangi oti me te kore hoahoa whenua hipoki; Tawhā tatau: Plate FR-4, pereti matotoru 1.6mm+/-10%, pereti dielectric tamau 4.4+/-0.2, parahi matotoru 1.0 oz (1.4mil) solder hinu matotoru 0.6±0.2mil, dielectric tamau 3.5+/-0.3.

Te hoahoa impedance o nga papa e rua me te wha

100 ohm impedance pārōnaki e taunakitia ana te whanui raina hoahoa me te mokowhiti 5/7/5mil te tawhiti i waenga i nga takirua ≥14mil(3W criterion) tuhipoka: e taunaki ana kia whakamahia te kopaki whenua mo te roopu katoa o nga taura tohu rereke. Ko te tawhiti i waenga i te tohu rereke me te taura whenua whakamarumaru kia 35mil (kaua e iti iho i te 20mil i nga keehi motuhake). 90ohm impedance rerekëtanga E taunakitia ana te whanui o te raina hoahoa me te mokowhiti 6/6/6mil Te tawhiti takirua rereke ≥12mil(3W criterion) Nga kaupapa matua: I roto i te take o te taura takirua rereke roa, e taunaki ana kia tawhiti te tawhiti i waenga i nga taha e rua o te raina rereke USB takai i te whenua ma te 6mil hei whakaiti i te tupono o te EMI (takahia te whenua kia kaua e takai te whenua, he rite tonu te whanui raina me te paerewa tawhiti o te raina). Tawhā tātai: Fr-4, pereti matotoru 1.6mm+/-10%, pereti dielectric tamau 4.4+/-0.2, parahi matotoru 1.0oz (1.4mil) pepa āhua-whakaora (PP) 2116(4.0-5.0mil), dielectric tamau 4.3+/ -0.2 solder hinu matotoru 0.6±0.2mil, Dielectric pūmau 3.5+/-0.3 hanganga whakarārangitia: paparanga tā mata paparanga konuhono paparanga parapara paparanga parapara kiriata kua pania parani te paninga konukura kiriata ahua-whakaorangia te paparanga konukura paparanga parani paparanga paparanga mata.

Torutoru. E ono paparanga hoahoa impedance papa

He rereke te hanganga lamination e ono-papa mo nga waa rereke. Ko tenei aratohu anake e taunaki ana i te hoahoa o te lamination noa ake (tirohia te FIG. 2), a ko nga hoahoa e whai ake nei e tohuhia ana i runga i nga raraunga i whiwhi i raro i te raima i te FIG. 2. Ko te hoahoa impedance o te paparanga o waho he rite ki tera o te papa wha-papa. Na te mea ko te paparanga o roto he maha ake nga paparangi rererangi i te paparanga mata, he rereke te taiao hiko i te paparanga mata. Ko nga whakaaro e whai ake nei mo te mana impedance o te paparanga tuatoru o nga waea (whakaahua 4). 90 ohm impedance pārōnaki E taunakitia ana te whanui raina hoahoa, tawhiti raina 8/10/8mil Rerekētanga takirua tawhiti ≥20mil(3W paearu); Tawhā tātai: Fr-4, pereti matotoru 1.6mm+/-10%, pereti dielectric tamau 4.4+/-0.2, parahi matotoru 1.0oz (1.4mil) pepa āhua-whakaora (PP) 2116(4.0-5.0mil), dielectric tamau 4.3+/ -0.2 solder hinu matotoru 0.6±0.2mil, Dielectric pūmau 3.5+/-0.3 hanganga whakarārangitia: paparanga ārai mata o runga paparanga parahi paparanga parahi-whakakikoruatia-a-whare-whakaorangia-parapara-parapara-kore-kore-kore-kore-kore-para-parapara-whakaorangia-parapara-parapara-parapara o raro paparanga arai mata.

Mo te neke atu i te wha, e ono nga paparanga, me hoahoa koe i runga i nga ture e tika ana, me korero ranei ki nga kaimahi whai take ki te whakatau i te hanganga raima me te kaupapa waea.

5. Mena kei etahi atu whakaritenga whakahaere impedance na runga i nga ahuatanga motuhake, tena koa tatauhia e koe, me korero ranei ki nga kaimahi whai mana ki te whakatau i te kaupapa hoahoa.

Tuhipoka: ① He maha nga keehi e pa ana ki te impedance. Ki te hiahia te PCB ki te kia whakahaeretia e te impedance, kia mārama tohu nga whakaritenga o te mana impedance i roto i te raraunga hoahoa PCB pepa tauira ranei; (2) Ko te 100 ohm rereke rereke te nuinga e whakamahia ana mo nga tohu HDMI me te LVDS, kei roto i te HDMI me tuku te tiwhikete e tika ana he whakahau; ③ 90 ohm impedance pārōnaki te nuinga whakamahia mō te tohu USB; (4) Ko te waahanga kotahi 50 ohm impedance te nuinga e whakamahia ana mo tetahi waahanga o te tohu DDR. I te mea ko te nuinga o nga matūriki DDR e mau ana i te hoahoa o roto e rite ana ki te impedance, ko te hoahoa kei runga i te papa Demo i whakaratohia e te kamupene otinga hei tohutoro, a kaore i te tūtohutia tenei aratohu hoahoa. ⑤, kotahi-mutunga 75-ohm impedance te nuinga whakamahia mō te tāuru ataata tairitenga me te putanga. He parenga 75-ohm e rite ana ki te parenga whenua i runga i te hoahoa ara iahiko, na reira kaore e tika ki te kawe i te hoahoa whakahoahoa impedance i roto i te Tahora PCB, engari me tohu ko te 75-ohm te parenga whenua i roto i te raina me noho tata. ki te titi kāpeka. Ka whakamahia noa te PP.