256 Frequency Divider, Kulowetsa pafupipafupi 0.3 ~ 30GHz

A 256 frequency divider ndi gawo la digito lomwe limachepetsa ma frequency a siginecha yolowera mpaka 1/256 ya ma frequency ake oyambira. Makhalidwe ake ndi ntchito zake ndi izi:

Makhalidwe:
1. Large frequency kugawa coefficient
Magawo afupipafupi ndi 256: 1, oyenera zochitika zomwe zimafuna kuchepetsa pafupipafupi, monga kupanga mawotchi otsika kwambiri kuchokera ku mawotchi apamwamba kwambiri.
2. Mipikisano mlingo choyambitsa dongosolo
Nthawi zambiri amapangidwa ndi ma 8-level binary counters (monga ma 8-bit counters), monga 2 ^ 8=256, ma flops angapo amafunika kutsika, zomwe zingayambitse kuchedwa.
3. Ntchito yotulutsa
Kuzungulira kwa ntchito kwa kauntala wamba wa binary ndi 50%, koma gawo lapakati litha kukhala losafanana. Ngati kuzungulira kwathunthu kwa 50% kumafunika, kukonza kwamalingaliro owonjezera (monga mayankho kapena kuphatikiza ma frequency chain) ndikofunikira.
4. Kukhazikika kwakukulu
Kutengera kapangidwe ka digito, imakhala ndi kulondola kwafupipafupi kwanthawi yayitali, sikukhudzidwa kwambiri ndi zinthu zachilengedwe monga kutentha ndi magetsi, ndipo imadalira kukhazikika kwa siginecha.
5. Kugwiritsa ntchito mphamvu zochepa ndi kuphatikiza
Ukadaulo wamakono wa CMOS umakhala ndi mphamvu zochepa, ndiosavuta kuphatikiza mu FPGA, ASIC kapena microcontroller, ndipo umakhala ndi zinthu zochepa.

Ntchito:
1. Njira yolumikizirana
Mafupipafupi kaphatikizidwe: Mu gawo-lotsekedwa loop (PLL), chandamale chandamale amapangidwa pamodzi ndi voteji controlled oscillator (VCO); Magawo afupipafupi a Local oscillator (LO) mumapulogalamu a RF amatulutsa ma frequency amachannel angapo.
2. Digital signal processing
Kutsitsa: Chepetsani kuchuluka kwa zitsanzo kuti muchepetse kuchuluka kwa data, yomwe imagwiritsidwa ntchito molumikizana ndi kusefa kwa anti aliasing.
3. Zida zowonetsera nthawi ndi nthawi
Mu mawotchi a digito ndi nthawi zamagetsi, crystal oscillator (monga 32.768kHz) imagawidwa kukhala 1Hz kuyendetsa dzanja lachiwiri.
Kuchedwetsa kuyambitsa kapena kukonza nthawi ndi nthawi pakuwongolera mafakitale.
4. Zida zoyesera ndi zoyezera
Jenereta yamagetsi imapanga zizindikiro zoyesera zotsika kwambiri kapena imakhala ngati gawo logawanitsa pafupipafupi pa mita yafupipafupi.