I-256 Frequency Divider, Imvamisa Yokufaka 0.3~30GHz

I-256 frequency divider iyimojuli yesekethe yedijithali eyehlisa imvamisa yesiginali yokufaka ibe ngu-1/256 wefrikhwensi yayo yasekuqaleni. Izici zayo kanye nezicelo zimi kanje:

Izici:
1. I-coefficient yokuhlukanisa imvamisa enkulu
Isilinganiso sokuhlukaniswa kwefrikhwensi ngu-256:1, ifanele izimo ezidinga ukuncishiswa kwefrikhwensi okubalulekile, njengokukhiqiza amasiginali okulawula imvamisa ephansi ukusuka emawashi anefrikhwensi ephezulu.
2. Multi level trigger isakhiwo
Ngokuvamile kwakhiwa izinto zokubala kanambambili zamaleveli angu-8 (njengezinto zokubala ezingu-8-bit), njengokuthi 2 ^ 8=256, ama-flip flop amaningi adinga ukuchithwa, okungase kwethule ukubambezeleka kwe-cascading.
3. Umjikelezo womsebenzi wokukhiphayo
Umjikelezo womsebenzi wokukhipha ibhithi eliphezulu kakhulu kwekhawunta kanambambili elula ngu-50%, kodwa isigaba esimaphakathi singase sibe yi-asymmetric. Uma umjikelezo ogcwele womsebenzi ongu-50% udingeka, ukucutshungulwa okunengqondo okwengeziwe (njengempendulo noma inhlanganisela yeketango lokuvama) kuyadingeka.
4. Ukuzinza okuphezulu
Ngokusekelwe ekwakhiweni kwesekethe yedijithali, inokunemba okuphezulu kokuphuma kwemvamisa, ayithinteki kangako yizici zemvelo ezifana nezinga lokushisa kanye nogesi, futhi incike ekuzinzeni kwesignali yokufaka.
5. Ukusetshenziswa kwamandla okuphansi nokuhlanganiswa
Ubuchwepheshe besimanje be-CMOS busebenzisa amandla aphansi, kulula ukubuhlanganisa ku-FPGA, ASIC noma i-microcontroller, futhi busebenzisa izinsiza ezincane.

Isicelo:
1. Uhlelo lokuxhumana
I-Frequency synthesis: Ku-loop evaliwe ngesigaba (PLL), imvamisa eqondiwe ikhiqizwa ngokubambisana ne-oscillator elawulwa yi-voltage (VCO); I-Local oscillator (LO) ye-frequency division ezinhlelweni ze-RF ikhiqiza amafrikhwensi eziteshi eziningi.
2. Ukucubungula isignali yedijithali
I-Downsampling: Yehlisa izinga lokusampula ukuze unciphise inani ledatha, esetshenziswa ngokuhambisana nokuhlunga kwe-anti aliasing.
3. Imishini yokubeka isikhathi nesikhathi
Kumawashi edijithali nezibali sikhathi zikagesi, i-crystal oscillator (efana no-32.768kHz) ihlukaniswa ibe ngu-1Hz ukuze ishayele isandla sesibili.
Ukubambezeleka kokucupha noma ukuhlela umsebenzi ngezikhathi ezithile ekulawuleni izimboni.
4. Amathuluzi okuhlola nokulinganisa
Ijeneretha yesignali ikhiqiza amasignali okuhlola amafrikhwensi aphansi noma isebenza njengemojula yesihlukanisi esiyireferensi yemitha yefrikhwensi.