Cov-rau-analog converter: hauj lwm, kev khiav hauj lwm hauv paus ntsiab lus, daim ntawv thov.

Analog Pib ntsais koj teeb yus muaj los ntawm ib tug xov tooj ntawm cov kev tsis, yog ib tus uas yog tus oscillation zaus. Piv txwv li, cov tib neeg pob ntseg tau hnov qhov teeb muaj ib zaus nyob rau hauv ntau ntawm 1 mus rau 22 kHz, thiab qhov pom lub teeb muaj ib zaus ntsuas nyob rau hauv billions Hertz. Ib qho piv txwv ntawm ib qho kev analogue teeb liab yuav pab tau raws li cov ntaubntawv povthawj siv gramophone cov ntaub ntawv. Cov duab, dub thiab dawb thaum xub thawj, thiab ces, thiab cov xim - kuj yog ib qho piv txwv ntawm ib tug analog teeb liab cov ntaubntawv povthawj siv.

Cov-rau-analog converter yog yuav luag ib txwm tsim nyog tom qab lub analog-rau-digital converter (ADC), uas yuav pab tau hais ob peb lo lus, hais tias muaj yog ib tug meej teeb meem uas yog daws tau los ntawm lub ntaus ntawv nyob rau hauv kev saib xyuas los ntawm peb.

ADC converts tus analog teeb liab rau cov. Feem ntau cov xov tooj uas sau raws nkaus Ii mus rau lub teeb liab muaj nqis nyob rau lub sij hawm ntawm kev ntsuas, yog binary code. Txhua ntsuas yog ua nrog ib tug tej zaus, hu ua cov zauv tus nqi.

qhov tsawg kawg nkaus zauv tus nqi yog raws substantiated uas muab undistorted teeb liab rov qab. Qhov no teeb liab twb tsis muaj distortion thiab rov qab kho cov zis hauv lub digital rau analog teeb liab converter. quantizing zaus yuav tsum muaj tsawg kawg yog ob tug tshaj plaws zaus hloov dua siab tshiab lub teeb liab. Piv txwv li, rau transformation ntawm lub undistorted suab teeb liab sufficiently quantization zaus sib npaug zos rau 44 kHz.

Tam sim no nws yog tseeb hais tias cov digital-rau-analog converter yog lub tswv yim ib theem zuj zus ntawm binary cov lis dej num, uas nws yuav tsum tau hloov dua siab tshiab rau hauv ib tug coj analog teeb liab.

Ua hauj lwm muaj kev cia siab thiab kev pab cuam lub neej kuj muaj nyob rau hauv cov nuj nqis, tab sis cov no tsis tsis yog nyob ntawm seb kev khiav hauj lwm hauv paus ntsiab lus ntawm cov DAC, tab sis, theej los ntawm lub Cheebtsam thiab tsim kom muaj zoo. Txawm li cas los ntawm transformation hauv paus ntsiab lus DACs yog distinguished los ntawm cov yam ntxwv xws li cov dynamic ntau yam, lub conversion precision thiab lub sij hawm tsis.

Lub dynamic ntau yog txiav txim rau lub DAC tswv yim thiab tso zis, raws li tus piv ntawm cov nqi siab tshaj plaws ntawm lub tswv yim (tso zis) rau qhov tsawg kawg nkaus tswv yim (tso zis) tus nqi.

Ib tug ntawm cov sij hawm poob tsis yog tus ntxeev ntawm cov zauv zaus, lub sij hawm hu ua quantization. Nws yog to taub hais tias cov nqi no qhia txog cov ADC, ntawm uas lub teeb liab tau hloov dua siab tshiab rau DAC.

Cov yooj yim kom muaj nuj nqis characterizing cov kev ceev ntawm lub DAC yog lub hloov dua siab tshiab lub sij hawm. Ntawm no yog peb yuav tsum xaiv ntawm ua lub hloov dua siab tshiab - DACs ntau yog, tab sis tsawg dua li nws cov ceev, thiab vice versa.

Xav txog tej hauv paus ntsiab lus ntawm converting "digital-rau-analog", tsis tau muab cov qauv thiab schemes. Muaj ob hloov dua siab tshiab ntsiab cai - serial thiab thaum uas tig mus.

Cov kab sab ntawm cov leb ntawm lub tswv yim ntawm cov-to-analog converter converts ib theem zuj zus ntawm lub pulses ntawm cov qhov tso zis. Ib tug mem tes dav thiab luv tom ntej mus rau nws ua ntej lub tom ntej no mem tes yog txiav txim nyob rau hauv lub tuaj binary code. Li no, cov qhov tso zis tsawg-pass lim yog tau ib tug analog teeb liab los ntawm pulses mus txog rau ib lub tswv yim nrog ib tug kuj tsis paub meej lub sij hawm.

Parallel hloov dua siab tshiab yog ua, piv txwv li, ntawm resistors kev cob cog rua nyob rau hauv uas tig mus rau ib tug ruaj khov fais fab mov. Tus nab npawb ntawm resistors yog sib npaug zos rau cov me ntsis tswv yim mus rau lub tswv yim code. Lub kuj muaj nqis nyob rau hauv lub tseem ceeb tshaj plaws zauv yog 2 lub sij hawm tsawg tshaj li nyob rau hauv lub yav dhau los LSB. Nyob rau hauv txhua kuj Circuit Court muaj ib tug tseem ceeb. Access code lwm yam uas tus yuam sij - qhov twg 1, tam sim no tsev. Thiaj li, nyob rau hauv lub tam sim no Circuit Court yuav tsum tau txiav txim los ntawm tus luj ntawm lub paug, thiab digital-rau-analog converter tso zis muaj ib tug nqa tam sim no uas yuav sib haum mus rau lub binary code kaw.