Muburyo bwo gushushanya PCB, mbere yo kunyura, muri rusange dushyira ibintu dushaka gukora, kandi tukabara impedance dukurikije umubyimba, substrate, umubare wibice nandi makuru. Nyuma yo kubara, ibikurikira birashobora kuboneka muri rusange.

Nkuko bigaragara kuri iyi shusho yavuzwe haruguru, igishushanyo mbonera kimwe cyarangiye hejuru muri rusange kiyobowe na 50 oms, abantu benshi rero bazabaza impamvu bisabwa kugenzura ukurikije 50 oms aho kuba 25 oms cyangwa 80 oms?
Mbere ya byose, 50 ohms yatoranijwe kubisanzwe, kandi buriwese muruganda yemera agaciro. Muri rusange, amahame runaka agomba gutegurwa nishirahamwe ryemewe, kandi buriwese arashushanya akurikije ibipimo.
Igice kinini cyikoranabuhanga rya elegitoronike riva mubisirikare. Mbere ya byose, ikoranabuhanga rikoreshwa mu gisirikare, kandi ryimurwa buhoro buhoro riva mu gisirikare rijya mu bikorwa bya gisivili. Mu minsi ya mbere ya microwave ikoreshwa, mugihe cyintambara ya kabiri yisi yose, guhitamo impedance byaterwaga rwose nibikenewe gukoreshwa, kandi nta gaciro gasanzwe kariho. Hamwe niterambere ryikoranabuhanga, hagomba gutangwa ibipimo ngenderwaho kugirango habeho kuringaniza ubukungu nuburyo bworoshye.

Muri Amerika, imiyoboro ikoreshwa cyane ihujwe n'inkoni zisanzwe hamwe n'imiyoboro y'amazi. 51.5 ohm irasanzwe cyane, ariko adaptate nabahindura babonetse kandi bakoreshwa ni 50-51.5 oms; ibi byakemuwe kubisirikare bihuriweho na navy. Ikibazo, umuryango witwa JAN washinzwe (nyuma umuryango wa DESC nyuma), wateguwe byumwihariko na MIL, hanyuma uhitamo 50 ohm nyuma yo kubitekerezaho neza, kandi catheteri ijyanye nayo yarakozwe ihindurwa insinga zitandukanye. Ibipimo.

Muri iki gihe, igipimo cy’iburayi cyari 60 oms. Bidatinze, bayobowe n’amasosiyete yiganje nka Hewlett-Packard, Abanyaburayi na bo bahatiwe guhinduka, bityo 50 oms amaherezo iba ihame mu nganda. Byahindutse ihame, kandi PCB ihujwe ninsinga zinyuranye irasabwa kubahiriza amahame 50 ya ohm impedance yo guhuza impedance.

Icya kabiri, gushyiraho ibipimo rusange bizashingira kubitekerezo byuzuye kubikorwa bya PCB no gukora igishushanyo mbonera.

Urebye uburyo bwa PCB bwo gutunganya no gutunganya tekinoroji, kandi urebye ibikoresho byabakora PCB benshi basanzwe, biroroshye kubyara PCBs hamwe na 50 ohm impedance. Uhereye kubikorwa byo kubara impedance, birashobora kugaragara ko impedance yo hasi cyane isaba ubugari bwumurongo mugari hamwe nubunini buciriritse cyangwa nini ya dielectric ihoraho, bikaba bigoye guhura nubuyobozi buri hejuru cyane mu kirere; inzitizi ndende cyane isaba umurongo woroheje Itangazamakuru ryagutse kandi ryinshi cyangwa itangazamakuru rito rya dielectric ntabwo rifasha guhagarika EMI na kambuka. Muri icyo gihe, ubwizerwe bwo gutunganya imbaho ​​nyinshi kandi duhereye ku musaruro rusange uzaba muke. Igenzura 50 ohm impedance. Munsi yibidukikije byo gukoresha imbaho ​​zisanzwe (FR4, nibindi) hamwe nibibaho bisanzwe, utange ibicuruzwa bisanzwe byimbaraga (nka 1mm, 1.2mm, nibindi). Ubugari busanzwe (4 ~ 10mil) burashobora gushushanywa. Uruganda rworoshye cyane gutunganya, kandi ibikoresho bisabwa kugirango bitunganyirizwe ntabwo biri hejuru cyane.

Urebye igishushanyo cya PCB, 50 oms nayo yatoranijwe nyuma yo gutekereza neza. Uhereye ku mikorere ya PCB, impedance nkeya muri rusange ni nziza. Ku murongo wohereza hamwe n'ubugari bwatanzwe, uko intera igenda yegereza indege, EMI ijyanye nayo izagabanuka, kandi inzira nyabagendwa nayo izagabanuka. Nyamara, ukurikije inzira yerekana ibimenyetso byuzuye, kimwe mubintu byingenzi bigomba gusuzumwa, ni ukuvuga ubushobozi bwo gutwara chip. Mu minsi ya mbere, chip nyinshi ntizashoboraga gutwara imirongo yoherejwe hamwe na impedance iri munsi ya 50 oms, kandi imirongo yohereza hamwe nimbogamizi nyinshi ntibyari byoroshye kubishyira mubikorwa. 50 ohm impedance ikoreshwa nkubwumvikane.

Inkomoko: Iyi ngingo yimuwe kuri enterineti, kandi uburenganzira ni ubwanditsi bwumwimerere.