Ukuba kule minyaka ikrelekrele, kule ntsimi, ufuna ukuba nesakhono kwi-FPGA, ilizwe liyakukushiya, amaXesha aya kukushiya.

Ukuqwalaselwa kwenkqubo yesantya esiphezulu PCB design related to serdes applications are as follows:

(1) I-Microstrip kunye ne-Stripline wiring.

Imigca ye-Microstrip yi-wiring ngaphezulu komaleko wangaphandle wenqwelomoya (GND okanye iVcc) eyahlulwe yimithombo yeendaba zombane ukunciphisa ukulibaziseka; Iingcingo zeribhoni zihanjiswe kumaleko ophawu lwangaphakathi phakathi kweenqwelomoya ezimbini (i-GND okanye iVcc) ukulungiselela amandla amakhulu okuphendula, ulawulo lwe-impedance olulula kunye nomqondiso ococekileyo, njengoko kubonisiwe kulo mzobo.

Umgca weMicrostrip kunye nomgca wokucoca zilungele iintambo

(2) Isantya esiphezulu somahluko wentsimbi.

Iindlela eziqhelekileyo zokubiyela ngesantya esiphezulu somahluko wesibini zibandakanya i-Edge Coupled microstrip (umaleko ophezulu), i-Edge edityaniswe ngeribhoni yomgca (umaleko womqondiso odibeneyo, ofanelekileyo kwisantya esiphezulu se-SERDES isibini somqondiso) kunye ne-Broadside Coupled microstrip, njengoko kubonisiwe kulo mzobo.

Isantya esiphezulu sokwahlulahlulahlula iintambo zombane

(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. Zintathu iindidi ze-bypass capacitors ezisetyenziswa ikakhulu kwinkqubo ye-FPGA: inkqubo yesantya esiphezulu (100MHz ~ 1GHz) esetyenziswa ngokuxhaphakileyo ngokudlula kwii-capacitors ukusuka ku-0.01nF ukuya kwi-10nF, ngokubanzi isasazwa ngaphakathi kwe-1cm ukusuka kwi-Vcc; Inkqubo yesantya esiphakathi (ngaphezulu kweshumi se-MHZ 100MHz), uluhlu oluqhelekileyo lokudlula kwi-capacitor yi-47nF ukuya kwi-100nF ye-tantalum capacitor, ngokubanzi ngaphakathi kwe-3cm ye-Vcc; Inkqubo yesantya esisezantsi (ngaphantsi kwe-10 MHZ), indawo esetyenziswa ngokuxhaphakileyo ye-bypass capacitor yi-470nF ukuya kwi-3300nF capacitor, ubeko kwi-PCB bukhululekile.

(4) Amandla okubeka intambo ngokufanelekileyo.

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

Ukufakelwa kweentambo ezifanelekileyo

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.

Ipini nganye okanye umngxunya we-GND kufuneka uqhagamshelwe kwindiza yomhlaba.

(5) amanqaku aphambili esantya esiphezulu senkqubo yewotshi yewotshi.

Kulumkele ukubhijela nge-zigzag kunye neewotshi zendlela ngokuthe ngqo kangangoko kunokwenzeka.

Zama ukuhambisa umaleko omnye wesiginali.

Sukusebenzisa imingxunya yokugqobhoza kangangoko kunokwenzeka, kuba ukugqobhoza kuya kuzisa ukubonakaliswa okuqinileyo kunye nokungahambelani kakuhle.

Sebenzisa i-microstrip wiring kumaleko aphezulu kangangoko ukunqanda ukusetyenziswa kwemingxunya kunye nokunciphisa ukulibaziseka kwesiginali.

Beka inqwelomoya emhlabeni kufutshane nocingo lomqondiso wewotshi ukunciphisa ingxolo kunye necrosstalk. Ukuba kusetyenziswa umaleko wesiginali yangaphakathi, umaleko wesiginali yewotshi unokubekwa phakathi kweeplanethi ezimbini zomhlaba ukunciphisa ingxolo kunye nokuphazamiseka. Nciphisa ukulibaziseka komqondiso.

Umqondiso wewotshi kufuneka ulungiswe ngokuchanekileyo.

(6) Imicimbi efuna ingqwalaselo kwinkqubo yokudibanisa isantya esiphezulu kunye nokudibanisa iintambo.

Note the impedance matching of the differential signal.

Qaphela ububanzi bomgca wesiginali esahlukileyo ukuze unyamezele i-20% yokunyuka komqondiso okanye ixesha lokuwa.

Kunye nezihlanganisi ezifanelekileyo, imvamisa yokulinganiswa kwesinxibelelanisi kufuneka ihlangabezane nelona nani liphezulu loyilo.

Ukudibanisa isibini esitshatileyo kufuneka kusetyenziswe kangangoko kunokwenzeka ukunqanda ukudityaniswa kwezibini ezibanzi, umthetho we-3S wamaqhekeza kufuneka usetyenziselwe ukunqanda ukudibanisa ngaphezulu okanye i-crossword.

(7) Amanqaku okucoca ingxolo kwiinkqubo ezikhawulezayo.

Ukunciphisa uphazamiseko lwamaxesha asezantsi (ngezantsi kwe-1KHz) ebangelwa yingxolo yomthombo wamandla, kwaye ungeze ukukhusela okanye ukucoca isekethe kwisiphelo sokufikelela kumthombo ngamnye wamandla.

Yongeza isihluzo se-100F se-electrolytic capacitor kwindawo nganye apho unikezelo lwamandla lungena kwi-PCB.

Ukunciphisa ingxolo yokuhamba ngesantya esiphezulu, beka ii-capacitors ezininzi zokudibanisa kwi-Vcc nganye nakwi-GND ngokusemandleni.

Beka iiplani zeVcc kunye ne-GND ngokulinganayo, uwahlule nge-dielectric (enjenge-FR-4PCB), kwaye ubeke ii-capacitors zokudlula kwezinye iindawo.

(8) inkqubo ngesantya esiphezulu Ground Bounce

Zama ukongeza i-capacitor decoupling kwisibini ngasinye somqondiso weVcc / GND.

Isilinganisi sangaphandle songezwa kwisiphelo sesiphelo seempawu zokuguqula isantya esiphezulu ezinje ngee-counters ukunciphisa imfuneko yokuqhuba.

Imowudi yeSlow Slew (ithambeka elisezantsi) imiselwe imiqondiso yokuphuma engadingi santya siphezulu.

Ukulawula umthwalo wokuphendula.

Nciphisa isignali yokutsiba iwotshi, okanye uyihambise ngokulinganayo kangangoko kunokwenzeka kwi-chip.

Umqondiso ophuma rhoqo usondele kwipini ye-GND ye-chip ngangokunokwenzeka.

Uyilo lwesekethe yexesha elungelelanisiweyo kufuneka ukunqande ukubuyela umva kwemveliso kwangoko.

Ukuphambukisa unikezelo lwamandla kunye nomhlaba kungadlala indima kulungiso jikelele.