Kuti uve nechokwadi chekufambisa kwechiratidzo, kuderedza kupindira kweEMI, uye kupasa kwakakodzera impedance test certification, PCB kiyi chiratidzo impedance yekufananidza dhizaini inodiwa. Iyi dhizaini yedhizaini yakavakirwa payakajairwa calculation paramita, TV chigadzirwa chiratidzo maitiro, PCB Layout zvinodiwa, SI9000 software kuverenga, PCB mupi wemhinduro ruzivo uye zvichingodaro, uye pakupedzisira uuye kune yakakurudzirwa dhizaini. Inokodzera vazhinji PCB vatengesi ‘maitiro maitiro uye PCB bhodhi dhizaini ine impedance control zvinodiwa.

Poshi. Double panel impedance dhizaini

① Ground dhizaini: upamhi hwemutsara, kupatsanura 7/5/7mil pasi waya wakafara ≥20mil chiratidzo uye kureba waya yepasi 6mil, yega yega 400mil yepasi gomba; (2) Dhizaini isina-enveloping: upamhi hwemutsara, kupatsanura 10/5/10mil musiyano peya uye chinhambwe pakati pevaviri ≥20mil (mamiriro ezvinhu akasarudzika haagone kuva asingasviki 10mil) zvinokurudzirwa kuti boka rese remutsara wechiratidzo mutsara uchishandisa envelopu. kudzivirira, chiratidzo chekusiyanisa uye kudzivirira pasi kureba ≥35mil (yakakosha mamiriro haagone kuve asingasviki 20mil). 90 ohm musiyano impedance yakakurudzirwa dhizaini

Line upamhi, spacing 10/5/10mil Ground waya upamhi ≥20mil Chiratidzo uye pasi waya kureba 6mil kana 5mil, grounding gomba ose 400mil; ②Usasanganisira dhizaini:

Mutsetse wakafara uye kupatsanurwa 16/5/16mil chinhambwe chiri pakati peiyo inosiyanisa chiratidzo peya ≥20mil zvinokurudzirwa kuti enveloping yepasi ishandiswe kuboka rese remasaini matambo tambo. Nharaunda pakati pechiratidzo chekusiyanisa uye tambo yepasi yakadzivirirwa inofanira kuva ≥35mil (kana ≥20mil mumatambudziko anokosha). Pfungwa huru: kupa zvakakosha kushandiswa kwevhu rakavharwa dhizaini, mutsara mupfupi uye ndege yakakwana inogona kushandiswa pasina yakavharwa pasi dhizaini; Kuverengera parameters: Ndiro FR-4, ndiro ukobvu 1.6mm+/-10%, ndiro dielectric nguva dzose 4.4+/-0.2, mhangura ukobvu 1.0 oz (1.4mil) solder mafuta ukobvu 0.6±0.2mil, dielectric nguva dzose 3.5+/-0.3.

Impedans dhizaini maviri uye mana akaturikidzana

100 ohm differential impedance yakakurudzirwa dhizaini mutsara wakafara uye spacing 5/7/5mil chinhambwe pakati pevaviri ≥14mil(3W criterion) chiziviso: zvinokurudzirwa kuti enveloping yepasi ishandiswe kuboka rose resiyaniso tambo dzechiratidzo. Nharaunda pakati pechiratidzo chekusiyanisa uye tambo yepasi inodzivirira inofanira kunge iine 35mil (kwete pasi pe20mil muzviitiko zvakakosha). 90ohm differential impedance Inokurudzirwa dhizaini mutsara wakafara uye kupatsanura 6/6/6mil Differential pair distance ≥12mil(3W criterion) Mapoinzi makuru: Kana iri nyaya yetambo refu yekusiyanisa, zvinokurudzirwa kuti chinhambwe chiri pakati pemativi maviri e USB mutsara mutsara. kuputira pasi ne6mil kuderedza EMI njodzi (kuputira pasi uye kwete kuputira pasi, mutsara wehupamhi uye mutsara nhanho nhanho inowirirana). Calculation parameters: Fr-4, kukora kweplate 1.6mm+/-10%, ndiro dielectric inogara iri 4.4+/-0.2, Copper ukobvu 1.0oz (1.4mil) semi-cured sheet (PP) 2116 (4.0-5.0mil), dielectric constant 4.3+/ -0.2 solder mafuta ukobvu 0.6±0.2mil, Dielectric inogara 3.5+/- 0.3 laminated chimiro: screen printing layer solder layer yemhangura layer semi-yakapora firimu yakavharwa nemhangura substrate semi-yakapora firimu remhangura layer solder layer screen printing layer

Tatu. Six layer board impedance dhizaini

Iyo matanhatu-layer lamination chimiro chakasiyana kune dzakasiyana zviitiko. Uyu mutungamiri anongokurudzira kugadzirwa kweiyo yakawanda yakajairika lamination (ona FIG. 2), uye zvinotevera zvinokurudzirwa zvirongwa zvinobva pane data yakawanikwa pasi pelamination muFIG. 2. Iyo impedance dhizaini yekunze dhizaini yakafanana neyechina-layer board. Nekuda kwekuti iyo yemukati layer inowanzove neakawanda mitsara yendege kupfuura iyo yepamusoro, iyo electromagnetic nharaunda yakasiyana nepamusoro pedenga. Izvi zvinotevera mazano ekudzivirira kwekudzivirira kwechikamu chechitatu che wiring (laminated reference Mufananidzo 4). 90 ohm differential impedance Recommended design line width, line distance 8/10/8mil Difference pair distance ≥20mil(3W criterion); Calculation parameters: Fr-4, kukora kweplate 1.6mm+/-10%, ndiro dielectric inogara iri 4.4+/-0.2, Copper ukobvu 1.0oz (1.4mil) semi-cured sheet (PP) 2116 (4.0-5.0mil), dielectric constant 4.3+/ -0.2 solder mafuta ukobvu 0.6±0.2mil, Dielectric inogara 3.5+/-0.3 laminated chimiro: chepamusoro chidzitiro chinovharira layer yemhangura semi-yakaporeswa yemhangura-yakavharidzirwa substrate semi-yakaporeswa mhangura-yakavharidzirwa substrate semi-yakaporeswa mhangura-yakavharwa dhizaini yezasi inovharira layer

Kweanopfuura mana kana matanhatu akaturikidzana, ndapota gadzira wega zvinoenderana nemitemo yakakodzera kana kubvunza vashandi vakakodzera kuti vaone iyo lamination chimiro uye wiring chirongwa.

5. Kana paine zvimwe zvinodiwa zvekudzora impedance nekuda kwemamiriro akakosha, ndapota verenga wega kana kubvunza vashandi vakakodzera kuti vaone chirongwa chekugadzira.

Ongorora: ① Pane akawanda kesi anokanganisa impedance. Kana iyo PCB ichida kudzorwa ne impedance, izvo zvinodiwa zve impedance control zvinofanirwa kuratidzirwa zvakajeka muPCB dhizaini data kana sampuli pepa; (2) 100 ohm kusiyanisa impedance inonyanya kushandiswa kuHDMI neLVDS masaini, umo HDMI inoda kupfuudza yakakodzera chitupa inosungirwa; ③ 90 ohm kusiyanisa impedance inonyanya kushandiswa kune USB chiratidzo; (4) Imwe-terminal 50 ohm impedance inonyanya kushandiswa kune chikamu cheDDR chiratidzo. Sezvo akawanda maDDR particles anotora yemukati gadziriso inoenderana impedance dhizaini, dhizaini yakavakirwa paDemo board yakapihwa nekambani yemhinduro sereferensi, uye iyi dhizaini yedhizaini haina kukurudzirwa. ⑤, single-end 75-ohm impedance inonyanya kushandiswa kune analog vhidhiyo kupinza uye kubuda. Iko kune 75-ohm kuramba inoenderana nekupokana kwepasi pane dhizaini yedunhu, saka hazvifanirwe kuita impedance yekufananidza dhizaini muPCB Layout, asi zvinofanirwa kucherechedzwa kuti iyo 75-ohm yepasi kuramba mumutsara inofanira kuiswa padhuze. kune terminal pin. Inonyanya kushandiswa PP.