Kana mune ino nguva yakangwara, mune ino ndima, iwe uchida kuve nehunyanzvi muFPGA, ipapo nyika inokusiya iwe, Iyo Times inokusiya iwe.

Kufunga kweiyo yepamusoro-yekumhanyisa system PCB design related to serdes applications are as follows:

(1) Microstrip uye Stripline wiring.

Microstrip mitsara iri wiring pamusoro pekunze chiratidzo cheyero yereferensi ndege (GND kana Vcc) yakaparadzaniswa nemagetsi enhau kudzikisa kunonoka; Tambo dzeribhoni dzinoendeswa mukati mechiratidzo chemukati pakati pendege mbiri (GND kana Vcc) yekuwedzera capacitive reactance, nyore impedance control uye yakachena chiratidzo, sezvakaratidzwa mumufananidzo.

Microstrip mutsetse uye mutsara mutsara wakanakira wiring

(2) yakakwira-inomhanya kusiyanisa chiratidzo wiring.

Maitiro akajairwa ewiring ekumhanyisa-masiyano emasaini maviri anosanganisira Edge Akabatanidza microstrip (yepamusoro dura), Edge Yakabatanidzwa ribhoni mutsetse (yakadzamidzirwa chiratidzo chiratidzo, inokodzera kumhanya-kumhanya SERDES kusiyanisa chiratidzo chechipiri) uye Broadside Yakabatanidzwa microstrip, sezvakaratidzwa mumufananidzo.

High speed differential signal pair wiring

(3) bypass capacitance (BypassCapacitor).

Bypass capacitor is a small capacitor with very low series impedance, which is mainly used to filter high frequency interference in high speed conversion signals. Kune matatu marudzi ekupfuura ma capacitors anonyanya kushandiswa muFPGA system: yakakwira-mhanyisa system (100MHz ~ 1GHz) inowanzo shandiswa pakupfuura ma capacitors kubva pa0.01nF kusvika 10nF, inowanzo kugoverwa mukati me1cm kubva kuVcc; Pakati-inomhanya system (inopfuura gumi MHZ 100MHz), iyo yakajairika yekupfuura capacitor renji ndeye 47nF kusvika 100nF tantalum capacitor, kazhinji mukati me3cm yeVcc; Yakadzika-yekumhanyisa system (isingasviki 10 MHZ), iyo inowanzo shandiswa yekupfuura capacitor renji ndeye 470nF kusvika 3300nF capacitor, marongero ari paPCB anga akasununguka.

(4) Capacitance yakakwana wiring.

Capacitor wiring can follow the following design guidelines, as shown.

Inobata zvakakwana wiring

Capacitive pin pads are connected using large size through holes (Via) to reduce coupling reactance.

Use a short, wide wire to connect the pad of the capacitor pin to the hole, or directly connect the pad of the capacitor pin to the hole.

LESR capacitors (Low Effective Series Resistance) were used.

Pini yega yega yeGND kana gomba rinofanira kunge rakabatana ne ndege yepasi.

(5) Makiyi akakosha eiyo yepamusoro-yekumhanyisa system wachi wiring.

Dzivisa zigzag ichitenderera uye nzira mawachi seakananga sezvinobvira.

Edza kufambisa munzira imwe chete yechiratidzo.

Usashandise kuburikidza-maburi zvakanyanya sezvinobvira, sezvo kuburikidza-maburi anounza yakasimba kuratidzira uye impedance zvisizvo.

Shandisa microstrip wiring mudenga repamusoro zvakanyanya sezvazvinogona kudzivirira kushandiswa kwemakomba uye kudzora kunonoka kwechiratidzo.

Isa iyo ndege yepasi padhuze neiyo chiratidzo chiratidzo chewatch kusvika pazvinogoneka kudzikisa ruzha uye crosstalk. Kana mucherechedzo wemukati mechiratidzo ukashandiswa, chiratidzo chewachi chinogona kusungwa pakati pendege mbiri dzepasi kudzikisira ruzha nekukanganisa. Pfupisa chiratidzo kunonoka.

Chiratidzo cheawa chinofanira kunge chakanyatsoenderana impedance.

(6) Nyaya dzinoda kutariswa mune yekumhanyisa-sisitimu yekubatanidza uye wiring.

Note the impedance matching of the differential signal.

Cherekedza hupamhi hwemutsara wekusiyanisa chiratidzo kuitira kuti igone kutsungirira makumi maviri muzana echiratidzo chekumuka kana nguva yekudonha.

Nezvibatanidza zvakakodzera, iyo yakatarwa kuwanda kwechokubatanidza inofanirwa kusangana neiyo yepamusoro frequency yekugadzira.

Edge-vaviri coupling inofanirwa kushandiswa nepazvinogona napo kudzivirira kureba-vaviri coupling, 3S chidimbu mutemo unofanirwa kushandiswa kudzivirira pamusoro-kubatanidza kana crossword.

(7) Mazano pane kusefa ruzha kweanomhanya-mhanyisa masisitimu.

Deredza kudzikisira kwakawanda kwepasi (pazasi pe1KHz) inokonzerwa neruzha rwemagetsi, uye wedzera kudzivirirwa kana kusefa wedunhu pane yega yega magetsi sosi yekuwana magumo.

Wedzera 100F electrolytic capacitor firita panzvimbo imwe neimwe panowanikwa magetsi.

Kuti udzikise ruzha-ruzha ruzha, isa akawanda decoupling capacitors paVcc yega uye GND sezvinobvira.

Rongedza ndege dzeVcc neGND dzakafanana, dziparadzanise nema dielectric (senge FR-4PCB), woisa nekupfuura ma capacitors mune mamwe matunhu.

(8) Yekumhanyisa system system Ground Bounce

Edza kuwedzera decoupling capacitor kune yega Vcc / GND chiratidzo chevaviri.

Yekunze Buffer inowedzerwa kumagumo ekuburitsa kwakakwira-kumhanya kuchinjisa masaini senge makonti kudzora chinodiwa chekutyaira kugona.

Iyo Slow Slew (yakaderera-simuka-mutserendende) modhi yaive yakagadzirirwa zviratidzo zvekuburitsa izvo zvaisada kukurumidza kumhanyisa.

Chengetedza mutoro kugadzirisa.

Deredza iyo wachi inopuruzira chiratidzo, kana kuigoverana zvakaenzana sezvinobvira kutenderedza chip.

Chiratidzo chinofuratira kazhinji chiri padhuze nepini yeGND yechip sezvinobvira.

Dhizaini yeakaenderana nguva yedunhu inofanirwa kudzivirira iyo ipapo ipapo kuchinjika kwekuburitsa.

Kuchinja magetsi uye ivhu rinogona kutora chikamu mukukanganisa kwese.