Nws yog qhov tseeb tias cov teeb liab analog tuaj yeem hloov mus rau hauv cov digital siv lub modulator. Lub sij hawm analog-to-digital conversion (ADC) yog hais txog cov txheej txheem no.
Kev ua tiav ntawm analog-rau-digital conversion feem ntau suav nrog cov kauj ruam hauv qab no:
1. Qauv:Lub sij hawm tsis tu ncua yog siv los ua piv txwv cov teeb liab analog. Hauv kev sawv cev digital ntawm lub teeb liab, sampling zaus tsim qhov kev daws teeb meem ntawm lub cev. Lub Nyquist txoj kev xav hais tias qhov piv txwv cuam tshuam tsis tuaj yeem tshwm sim yog tias qhov piv txwv zaus tsawg dua lossis sib npaug rau ob zaug ntawm lub teeb liab bandwidth.
2.Quantization:Cov qauv analog teeb liab yog quantized rau hauv cov teeb liab digital. Ib qho quantizer maps txhua tus nqi coj mus rau qhov ze tshaj plaws discrete theem, qhia txog qhov yuam kev quantization. Qhov loj ntawm qhov quantization yuam kev nyob ntawm qhov kev daws teeb meem ntawm lub quantizer, piv txwv li, tus naj npawb ntawm cov theem sib cais txhua tus nqi piv txwv yog mapped rau.
3.Encoding:Cov kev sawv cev tsis sib xws ntawm cov qauv piv txwv yog hloov mus rau cov lej sib raug zoo, feem ntau hauv daim ntawv binary. Encoding yuav koom nrog ncaj qha binary encoding, Grey coding, thiab lwm yam.
Hom ADCs feem ntau suav nrog:
- Successive Approximation ADC:Nws kwv yees cov tswv yim teeb liab me ntsis los ntawm me ntsis thiab hloov nws mus rau hauv daim ntawv digital. Qhov kev kwv yees ua tiav ADC yog ib hom siv rau kev siv high-precision, nruab nrab-ceev daim ntaub ntawv.
- Integrating ADC:Nws hloov cov teeb liab los ntawm kev sib xyaw cov teeb liab tawm tswv yim nrog lub sijhawm siv hluav taws xob. Kev sib koom ua ke ADCs feem ntau yog siv rau hauv kev siv qis qis, siab precision.
- Flash ADC:Nws ntiav cov txheej txheem sib piv rau tib lub sijhawm sib piv cov teeb liab tawm tswv yim nrog cov txheej txheem siv hluav taws xob kom ncaj qha tsim cov txiaj ntsig digital. Flash ADCs ceev heev tab sis feem ntau tuaj nrog cov nqi siab dua, haum rau cov ntawv thov ceev.
Cov ADC hom no muaj cov yam ntxwv ua haujlwm sib txawv thiab daim ntawv thov scenarios. Xaiv hom ADC tsim nyog rau ib daim ntawv thov tshwj xeeb yog qhov tseem ceeb.
