DACDigital-To-AnalogCinverter
Digital-to-analog converter, tseem hu ua D / A converter, hu ua DAC, yog ib qho khoom siv uas hloov cov khoom digital rau hauv analog. D / A hloov khoom siv yog ib txwm ua los ntawm 4 ntu, uas yog lub cev hnyav tiv thaiv lub network, ua haujlwm kom muaj zog, siv fais fab mov thiab hloov mus rau analog Cov hloov digital-to-analog feem ntau siv hauv cov hloov digital-to-digital. Cov hloov pauv hluav taws xob-rau-digital yog A / D hloov, lossis ADCs rau luv, uas yog cov khoom siv uas hloov cov cim txuas ntxiv mus rau hauv cov cim hluav taws xob.
DAC, raws li lub npe cuam tshuam, yog kom hloov cov digital digital ua cim cov cim.
N-ntsis digital teeb liab raug rau 2 ^ N-1 analog qib ntawm ntau qhov sib txawv. Cov cim tseem ceeb ntawm DAC suav nrog kev daws teeb meem, qhov siab tshaj plaws ntawm kev ua haujlwm, daws lub sijhawm, siv fais fab, thiab lwm yam.
Lub DAC tsuas yog tsim cov ntawv sau npe digital, cov hloov hluav taws xob txuas hluav taws xob, cov tes taw hnyav me me, suav kev ua haujlwm ntawm cov tshuab hluav taws xob thiab cov khoom siv hluav taws xob (lossis cov khoom siv tas mus li). Siv cov lej ntawm cov khoom kom muaj nuj nqis hauv cov ntawv teev npe digital los tswj cov hloov hluav taws xob sib txuas ntawm cov khoom sib txuas, kom lub ntsis nrog tus lej 1 tsim cov nqi tam sim no sib luag rau nws cov nuj nqis me ntsis ntawm lub ntsis phaib network, thiab tom qab ntawd tam sim no tus nqi yog xam los ntawm kev ua haujlwm amplifier. Tawm thiab hloov mus rau tus nqi hluav taws xob.
Raws li cov tes hauj lwm sib txawv me ntsis sib txawv, cov sib txawv ntawm DAC tuaj yeem tsim, xws li lub cev tiv thaiv lub cev tiv thaiv DAC, R – 2R inverted T-puab ua hauj network DAC, thiab tus nqi tam sim no DAC network. Kev hloov pauv qhov tseeb ntawm qhov nyhav tsis sib xws network DAC nyob ntawm qhov siv hluav taws xob voltage VREF, raws li qhov tseeb ntawm qhov hloov hluav taws xob hloov pauv, ua haujlwm kom muaj suab nrov, thiab txhua qhov nyhav tsis tshua muaj nqi. Nws qhov tsis zoo yog tias qhov tsis kam ntawm txhua qhov hnyav resistor sib txawv. Thaum nws muaj ntau tus lej, qhov kev hloov pauv nws txawv. Qhov no coj txoj kev nyuaj los xyuas qhov tseeb, tshwj xeeb tshaj yog rau kev tsim cov kab sib chaws. Yog li no, sib xyaw ua ke DAC Cov Circuit Court no tsis tshua muaj siv nyob ib leeg.
Nws muaj ntau ntau R zoo tib yam R, 2R network ntu, txhua ntu sib nug rau cov ntsis nkag. Cov nodes txuas nrog nyob rau hauv series los ua inverted T-puab network. R – 2R inverted T-shaped resistor network DAC yog hom kev ua haujlwm ceev ceev thiab ntau daim ntawv thov. Piv nrog lub network tiv thaiv qhov hnyav, vim tias nws tsuas muaj ob qhov ua haujlwm tsis tseem ceeb ntawm R thiab 2R, nws dhau qhov kev luv luv tias tus nqi tiv thaiv ntawm qhov nyhav tsis kam yog qhov loj thiab qhov pib ua haujlwm loj.
Qhov tam sim no-hom DAC hloov mus tas li qhov chaw hloov pauv tam sim no mus rau lub network tiv thaiv. Sab hauv lub zog ntawm cov hluav taws xob tas li yog qhov loj heev, uas yog sib npaug rau qhov qhib kev sib txuas. Yog li ntawd, ua ke nrog hloov hluav taws xob, qhov ua rau ntawm nws hloov dua siab tshiab raug yog tsawg. Txaus ECL hloov Circuit Court ua rau hom DAC tuaj yeem paub txog qhov hloov siab ntawm kev nrawm nrog qhov hloov pauv hloov siab.