Kumakhadi-okutholwa kwedatha yesivinini esiphezulu (i-DAQ), ukuzinza nokunemba kwesignali yewashi kubalulekile ekuthathweni kwesampula nasekudlulisweni kwedatha. Ama-crystal oscillator ahlukile, aziwa ngomsindo wawo ophansi, ukungavikeleki okuphezulu ekuphazamisekeni, nokuzinza okuhle kakhulu, asetshenziswa kabanzi{2}}kuzinhlelo zokutholwa kwedatha yesivinini esiphezulu. Banikeza ukwesekwa okuthembekile kwewashi ikakhulukazi ezinhlelweni ezidinga amazinga aphezulu amasampula kanye nomkhawulokudonsa ophezulu.
1. Izinzuzo zama-Differential Oscillator
>> Umsindo wesigaba esiphansi:Inciphisa i-jitter yewashi, iqinisekisa{0}}amasampula anembe kakhulu.
>> Amandla Okunqanda{0}}Ukuphazamisa:Igcina ubuqotho besignali endaweni-yokudluliswa kwebanga elide nasezindaweni ezinomsindo kagesi.
>> Ikhwalithi Yesiginali Ephakeme:Ilungele-ukudluliswa kwedatha ngesivinini esiphezulu kanye{1}nezidingo zomkhawulokudonsa ophezulu, ikakhulukazi ezilungele{2}}amasampula okuvumelanisa eziteshini eziningi.
2. Izimo Zohlelo Lokusebenza
Kuye ngezidingo zamamojula ahlukahlukene angaphakathi ngaphakathi-kwekhadi le-DAQ elinesivinini esikhulu, ama-oscillator ahlukene adlala indima ebalulekile kuzimo ezintathu ezibalulekile ezichazwe ngezansi. Amafrikhwensi ajwayelekile nawo ahlinzekwa:
|
Isicelo Scenario |
Umsebenzi oyinhloko |
Amafrikhwensi ajwayelekile |
Amanothi Obuchwepheshe |
|
Iwashi le-FPGA High{0}}Ireferensi ye-Speed Transceiver |
Ihlinzeka ngewashi eliyireferensi lama-transceivers e-GTH/GTX ngaphakathi kwe-FPGA, asetshenziselwa-ukudlulisela idatha ye-speed uplink njenge-PCIe ne-10 Gigabit Ethernet. |
100MHz |
• 100MHz:Imvamisa yereferensi evamile yamabhasi ekhompyutha afana ne-PCIe ne-SATA. |
|
-Iwashi Lesampula Lejubane Le-ADC/DAC Eliphezulu |
Inquma ngokuqondile inani lamasampula. Ihlinzeka ngamaphethelo ewashi anembe,{1}}aphansi, aqinisekisa-ukuguqulwa kokwethembeka okuphezulu ukusuka kumasiginali e-analog kuya edijithali. |
250MHz |
• 250MHz:Okuvame ukusetshenziswa ku-JESD204B/C{1}}izixhumanisi zokuguqulela idatha yesivinini esiphezulu. |
|
{{0}Isihlahla Sewashi Esivumelanayo Sesiteshi Esiningi |
Isebenza njengomthombo oyisithenjwa oyinhloko we-chip yewashi yebhafa/yokusabalalisa kumakhadi-okutholwa kweziteshi eziningi. Ngemuva kokusatshalaliswa, ishayela wonke ama-ADC ukuthi asebenze ngokuhambisanayo, eqinisekisa ukuvumelana kuwo wonke amashaneli. |
100MHz |
• 100MHz:Okuvamile{0}injongo ephezulu{1}}umthombo wereferensi we-PLL wokunemba. |
3. Ama-Oscillator Ahlukile avela ku-Hangjing
I-HCI differential oscillator yamukelwa kabanzi ezinhlelweni zokutholwa kwedatha. Sinikeza lawa ma-oscillator ngosayizi bamaphakheji abane - 7050, 5032, 3225, kanye ne-2520 - futhi anezinhlobo ezintathu ezihlukene zokuphumayo - I-LVDS, i-LVPECL, ne-HCSL - esinikeza izinketho eziguquguqukayo ukuze zivumelane nezidingo zedizayini zekhasimende ezihlukahlukene.
I-HCI inganikeza izixazululo ezifanayo namasampuli amahhala. Uma kudingeka, sicela uxhumane nabadayisi bakho abazinikele noma ummeleli wezobuchwepheshe.