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+//Example11.7 // determine the feed back current If and analog output voltage

+clc;

+clear;

+close;

+Vref = 8  ;   // V

+BI = 001 ;   BI = 010 ;   BI = 110 ;

+Rf = 25*10^3 ; // Hz

+R = 0.2*Rf ;

+

+// The output current of given binary weighted resistor D/A converter is defined as

+

+// If = -(Vref/R)*(2^0*b0+2^-1*b1+2^-2*b2) ;

+

+// If = -(Vref/R)*(b0+2^-1*b1+2^-2*b2) ;

+

+// for the given value Rf,R and Vref the output current

+

+// If = -(1.6*10^-3)*(b0+2^-1*b1+2^-2*b2) ;

+

+// for the binary input 001 the feedback current If is given by

+b2 = 0 ;

+b1 = 0 ;

+b0 = 1 ;

+If = (1.6*10^-3)*(b0+2^-1*b1+2^-2*b2) ;

+disp('for the binary input 001 analog output is = '+string(If*1000)+ ' mA ');

+

+// An analog output voltage Vo is

+Vo = -If*Rf ;

+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');

+

+

+// for the binary input 010 the feedback current If is given by

+b2 = 0 ;

+b1 = 1 ;

+b0 = 0 ;

+If = (1.6*10^-3)*(b0+2^-1*b1+2^-2*b2) ;

+disp('for the binary input 010 analog output is = '+string(If*1000)+ ' mA');

+

+// the An analog output voltage Vo is

+Vo = -If*Rf ;

+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');

+

+

+// for the binary input 110 the feedback current If is given by

+b2 = 1 ;

+b1 = 1 ;

+b0 = 0 ;

+If = (1.6*10^-3)*(b0+2^-1*b1+2^-2*b2) ;

+disp('for the binary input 110 analog output is = '+string(If*1000)+ ' mA ');

+

+// the An analog output voltage Vo is

+Vo = -If*Rf ;

+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');