256 Zaus Faib, Zaus Nkag 0.3 ~ 30GHz

Ib qho 256 zaus faib yog ib qho digital circuit module uas txo qhov zaus ntawm lub teeb liab nkag mus rau 1/256 ntawm nws qhov zaus thawj. Nws cov yam ntxwv thiab daim ntawv thov yog raws li nram no:

Cov yam ntxwv:
1. Cov coefficient faib zaus loj
Qhov piv ntawm kev faib zaus yog 256: 1, tsim nyog rau cov xwm txheej uas xav tau kev txo qis zaus ntau, xws li tsim cov teeb liab tswj qis zaus los ntawm cov moos zaus siab.
2. Cov qauv ua kom ntau theem
Feem ntau muaj 8-theem binary counters (xws li 8-bit counters), raws li 2 ^ 8 = 256, ntau lub flip flops yuav tsum tau cascaded, uas yuav ua rau cascading qeeb.
3. Lub voj voog ua haujlwm tso zis
Lub voj voog ua haujlwm ntawm qhov tso zis siab tshaj plaws ntawm lub txee binary yooj yim yog 50%, tab sis theem nruab nrab yuav tsis sib xws. Yog tias xav tau lub voj voog ua haujlwm tag nrho 50%, kev ua tiav logic ntxiv (xws li kev tawm tswv yim lossis kev sib xyaw ua ke ntawm cov saw hlau zaus) yog qhov xav tau.
4. Kev ruaj khov siab
Raws li kev tsim hluav taws xob digital, nws muaj qhov tseeb ntawm cov zis zaus siab, tsis tshua cuam tshuam los ntawm cov yam ntxwv ib puag ncig xws li kub thiab voltage, thiab vam khom kev ruaj khov ntawm cov teeb liab nkag.
5. Kev siv hluav taws xob tsawg thiab kev koom ua ke
Cov thev naus laus zis CMOS niaj hnub no siv hluav taws xob tsawg, yooj yim rau kev koom ua ke rau hauv FPGA, ASIC lossis microcontroller, thiab siv cov peev txheej tsawg dua.

Daim Ntawv Thov:
1. Kev sib txuas lus
Kev tsim cov zaus: Hauv lub voj voog xauv theem (PLL), lub hom phiaj zaus yog tsim ua ke nrog lub oscillator tswj hwm hluav taws xob (VCO); Kev faib zaus oscillator hauv zos (LO) hauv cov ntawv thov RF tsim cov zaus ntau-channel.
2. Kev ua cov teeb liab digital
Downsampling: Txo tus nqi sampling kom txo tau cov ntaub ntawv, siv ua ke nrog anti aliasing filtering.
3. Lub sijhawm thiab cov khoom siv sijhawm
Hauv cov moos digital thiab cov sijhawm hluav taws xob, cov oscillator siv lead ua (xws li 32.768kHz) raug faib ua 1Hz los tsav lub tes thib ob.
Kev ncua sijhawm ua haujlwm lossis kev teem sijhawm ua haujlwm tsis tu ncua hauv kev tswj hwm kev lag luam.
4. Cov cuab yeej kuaj thiab ntsuas
Lub tshuab tsim teeb liab tsim cov teeb liab kuaj zaus qis lossis ua haujlwm ua lub module faib zaus rau lub ntsuas zaus.