Mba hiantohana ny kalitaon’ny fampitana famantarana, mampihena ny fitsabahan’ny EMI, ary mandalo ny fanamarinana fitsapana impedance mifandraika, PCB Ilaina ny famolavolana impedance famantarana lehibe. Ity torolàlana famolavolana ity dia mifototra amin’ny mari-pamantarana kajy mahazatra, ny toetran’ny vokatra amin’ny fahitalavitra, ny fepetra takiana amin’ny PCB, ny kajy rindrambaiko SI9000, ny fampahalalana momba ny valin’ny mpamatsy PCB sy ny sisa, ary farany dia tonga amin’ny famolavolana natolotra. Mety ho an’ny ankamaroan’ny mpamatsy PCB ny fenitry ny dingana sy ny PCB board drafitra miaraka amin’ny fepetra fanaraha-maso impedance.

Iray. Famolavolana impedance roa sosona

① Ground famolavolana: tsipika sakan’ny, elanelana 7/5/7mil tany tariby sakany ≥20mil famantarana sy ny tany tariby halavirana 6mil, isaky ny 400mil tany lavaka; (2) Non-enveloping famolavolana: tsipika sakan’ny, elanelana 10/5/10mil samy hafa tsiroaroa sy ny elanelana misy eo amin’ny mpivady ≥20mil (toe-javatra manokana dia tsy mety ho latsaky ny 10mil) dia soso-kevitra fa ny vondrona manontolo ny differential famantarana tsipika mampiasa enveloping fiarovana, mari-pamantarana samihafa ary fiarovana ny halaviran’ny tany ≥35mil (tsy latsaky ny 20mil ny toe-javatra manokana). 90 ohm differential impedance soso-kevitra famolavolana

Line sakany, elanelana 10/5/10mil Ground tariby sakan`ny ≥20mil Signal sy ny tany tariby lavitra ny 6mil na 5mil, grounding lavaka isaky ny 400mil; ②Aza ampidirina ny endrika:

Ny sakan’ny tsipika sy ny elanelana 16/5/16mil ny elanelana misy eo amin’ny mpivady signal differential ≥20mil dia soso-kevitra ny hampiasana ny fonon’ny tany ho an’ny vondrona tariby famantarana differential. Ny elanelana misy eo amin’ny mari-pamantarana samihafa sy ny tariby tany voaaro dia tsy maintsy ≥35mil (na ≥20mil amin’ny tranga manokana). Hevi-dehibe: omeo laharam-pahamehana ny fampiasana ny famolavolana tany voarakotra, ny tsipika fohy sy ny fiaramanidina feno dia azo ampiasaina tsy misy famolavolana tany voarakotra; Famaritana kajy: Plate FR-4, hatevin’ny takelaka 1.6mm +/-10%, takelaka dielectric constant 4.4+/-0.2, hatevin’ny varahina 1.0 oz (1.4mil) hatevin’ny menaka solder 0.6±0.2mil, dielectric constant 3.5+/-0.3.

Impedance famolavolana ny roa sy efatra sosona

100 ohm differential impedance soso-kevitra famolavolana tsipika sakan’ny sy ny elanelana 5/7/5mil ny elanelana misy tsiroaroa ≥14mil(3W criterion) fanamarihana: dia soso-kevitra ny tany enveloping ampiasaina ho an’ny vondrona manontolo ny differential tariby famantarana. Ny elanelana misy eo amin’ny mari-pamantarana samihafa sy ny tariby fiarovana dia tokony ho 35mil farafahakeliny (tsy latsaky ny 20mil amin’ny tranga manokana). 90ohm differential impedance Recommended design tsipika sakan’ny sy ny elanelana 6/6/6mil Differential pair halavirana ≥12mil(3W criterion) Hevi-dehibe: Raha ny lava differential tariby mpivady, dia soso-kevitra fa ny elanelana misy eo amin’ny lafiny roa amin’ny USB differential tsipika. fonosina 6mil ny tany mba hampihenana ny risika EMI (fonosana ny tany fa tsy fonosina ny tany, ny sakan’ny tsipika sy ny fenitry ny halaviran-dalana dia mifanaraka). Paramètre kajy: Fr-4, takelaka hatevin’ny 1.6mm +/-10%, lovia dielectric tsy tapaka 4.4+/-0.2, varahina hatevin’ny 1.0oz (1.4mil) semi-sitrana taratasy (PP) 2116(4.0-5.0mil), dielectric tsy tapaka 4.3+/ -0.2 solder menaka hatevin’ny 0.6±0.2mil, Dielectric tsy tapaka 3.5 +/- 0.3 laminated rafitra: lamba fanontam-pirinty sosona solder sosona varahina sosona semi-sitrana sarimihetsika mifono varahina substrate semi-sitrana sarimihetsika varahina sosona solder sosona lamba fanontam-pirinty sosona

Telo. Enina sosona board impedance famolavolana

Ny rafitra lamination enina sosona dia samy hafa amin’ny fotoana samihafa. Ity toro-lalana ity dia manoro hevitra fotsiny ny famolavolana ny lamination mahazatra kokoa (jereo ny Sary 2), ary ireto drafitra atolotra manaraka ireto dia mifototra amin’ny angona azo eo ambanin’ny lamination ao amin’ny Sary. 2. Ny endriky ny impedance amin’ny sosona ivelany dia mitovy amin’ny an’ny birao misy sosona efatra. Satria ny sosona anatiny amin’ny ankapobeny dia manana sosona fiaramanidina bebe kokoa noho ny sosona ambonin’ny tany, ny tontolo elektromagnetika dia tsy mitovy amin’ny sosona ambonin’ny tany. Ireto manaraka ireto ny soso-kevitra ho an’ny fanaraha-maso impedance ny fahatelo sosona ny wiring (laminated reference Figure 4). 90 ohm differential impedance Recommended design tsipika sakany, tsipika halavirana 8/10/8mil Difference mpivady halavirana ≥20mil (3W criterion); Paramètre kajy: Fr-4, takelaka hatevin’ny 1.6mm +/-10%, lovia dielectric tsy tapaka 4.4+/-0.2, varahina hatevin’ny 1.0oz (1.4mil) semi-sitrana taratasy (PP) 2116(4.0-5.0mil), dielectric tsy tapaka 4.3+/ -0.2 solder menaka hatevin’ny 0.6±0.2mil, Dielectric tsy miova 3.5 +/-0.3 rafitra laminated: ambony efijery fanakanana sosona varahina sosona semi-sitrana varahina-mifono substrate semi-sitrana varahina-mifono substrate semi-sitrana varahina-mifono sosona ambany lamba fisakanana sosona

Ho an’ny sosona efatra na enina mahery, azafady mamolavola ny tenanao araka ny fitsipika mifandraika amin’izany na manadihady amin’ny mpiasa mifandraika amin’izany mba hamaritana ny rafitra lamination sy ny rafitra tariby.

5. Raha misy fepetra fanaraha-maso impedance hafa noho ny toe-javatra manokana, azafady kajy amin’ny tenanao na manontania olona manan-danja mba hamaritana ny drafitra famolavolana

Fanamarihana: ① Betsaka ny tranga misy fiantraikany amin’ny impedance. Raha mila fehezin’ny impedance ny PCB, ny fepetra takian’ny fanaraha-maso impedance dia tokony ho marihina mazava ao amin’ny angon-drakitra famolavolana PCB na santionany; (2) 100 ohm differential impedance dia ampiasaina indrindra ho an’ny HDMI sy LVDS famantarana, izay HDMI mila mandalo ny fanamarinana mifandraika dia tsy maintsy; ③ 90 ohm differential impedance no tena ampiasaina amin’ny USB famantarana; (4) Single-terminal 50 ohm impedance dia ampiasaina indrindra amin’ny ampahany amin’ny famantarana DDR. Satria ny ankamaroan’ny poti DDR dia manaiky ny fanitsiana anatiny mifanandrify amin’ny famolavolana impedance, ny famolavolana dia mifototra amin’ny Demo board nomen’ny orinasa vahaolana ho fanondroana, ary ity torolàlana famolavolana ity dia tsy soso-kevitra. ⑤, tokana-end 75-ohm impedance no tena ampiasaina amin’ny Analog Video fampidirana sy Output. Misy fanoherana 75-ohm mifanandrify amin’ny fanoherana ny tany amin’ny famolavolana faritra, noho izany dia tsy ilaina ny manatanteraka ny famolavolana mifanaraka amin’ny impedance amin’ny PCB Layout, saingy tokony ho marihina fa ny fanoherana 75-ohm amin’ny tsipika dia tokony hapetraka akaiky. mankany amin’ny pin terminal. PP matetika ampiasaina.