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EE101: ADC and DAC circuits M. B. Patil [email protected] www.ee.iitb.ac.in/~sequel DepartmentofElectricalEngineering IndianInstituteofTechnologyBombay M.B.Patil,IITBombay * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. Introduction M.B.Patil,IITBombay * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. Introduction * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. M.B.Patil,IITBombay * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. Introduction * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. M.B.Patil,IITBombay * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. Introduction * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. M.B.Patil,IITBombay * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. Introduction * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. M.B.Patil,IITBombay Introduction * Realsignals(e.g.,avoltagemeasuredwithathermocoupleoraspeechsignal recordedwithamicrophone)areanalogquantities,varyingcontinuouslywith time. * Digitalformatoffersseveraladvantages: digitalsignalprocessing,storage,useof computers,robusttransmission,etc. * AnADC(Analog-to-DigitalConverter)isusedtoconvertananalogsignaltothe digitalformat. * Thereverseconversion(fromdigitaltoanalog)isalsorequired. Forexample, musicstoredinaDVDindigitalformatmustbeconvertedtoananalogvoltage forplayingoutonaspeaker. * ADAC(Digital-to-AnalogConverter)isusedtoconvertadigitalsignaltothe analogformat. M.B.Patil,IITBombay * Fora4-bitDAC,withinputS3S2S1S0,theoutputvoltageis VInAg=enKera(cid:2)l(,SV3A×=23K)+(cid:80)(N0S2−×1S2k22)k+. (S1×21)+(S0×20)(cid:3). * K isproportionaltothereferencevoltageVR. Itsvaluedependsonhowthe DACisimplemented. VA maximum output voltage resolution digital 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 DAC VR DN 1 − N-bit analog digital VA output input D2 D1 D0 ground M.B.Patil,IITBombay * K isproportionaltothereferencevoltageVR. Itsvaluedependsonhowthe DACisimplemented. VA maximum output voltage resolution digital 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 DAC VR DN 1 − N-bit analog digital VA output input D2 D1 D0 ground * Fora4-bitDAC,withinputS3S2S1S0,theoutputvoltageis VInAg=enKera(cid:2)l(,SV3A×=23K)+(cid:80)(N0S2−×1S2k22)k+. (S1×21)+(S0×20)(cid:3). M.B.Patil,IITBombay * K isproportionaltothereferencevoltageVR. Itsvaluedependsonhowthe DACisimplemented. DAC VA VR maximum output DN 1 voltage − N-bit analog digital VA output input D2 resolution D1 D0 ground digital 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 * Fora4-bitDAC,withinputS3S2S1S0,theoutputvoltageis VInAg=enKera(cid:2)l(,SV3A×=23K)+(cid:80)(N0S2−×1S2k22)k+. (S1×21)+(S0×20)(cid:3). M.B.Patil,IITBombay

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Real signals (e.g., a voltage measured with a thermocouple or a speech signal recorded with a microphone) are analog quantities, varying

EE101: ADC and DAC circuits PDF

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Real signals (e.g., a voltage measured with a thermocouple or a speech signal recorded with a microphone) are analog quantities, varying

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