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Digital to analog converter by using r -2r ladder

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satyanaryana

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hi,
in qucs DIGITAL TO ANALOG CONVTER BYUSING R-2R LADDER WITH OPAMP,
OUTPUT IS NOT ACCURATE.
PLZ HELP ME
 

which opamp you use in your design? also chk value of feedback resistance Rf , it should high compared to other resistance
 

what is your accuracy target? You have to consider the matching between resistor
 

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