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+//Example11.8 // determine the feed back current If and analog output voltage
+clc;
+clear;
+close;
+Vref = 5  ;   
+BI = 101 ;   BI = 011 ;   BI = 100 ;  BI = 001 ;
+Rf = 25*10^3 ; 
+R = 0.2*Rf ;
+
+// The output current of given R-2R ladder D/A converter is defined as
+
+// If = -(Vref/2*R)*(2^0*b0+2^-1*b1+2^-2*b2) ;
+
+// If = -(Vref/2*R)*(b0+2^-1*b1+2^-2*b2) ;
+
+// for the given value Rf,R and Vref the output current
+
+// If = (0.5*10^-3)*(b0+2^-1*b1+2^-2*b2) ;
+
+// for the binary input 101 the feedback current If is given by
+b2 = 1 ;
+b1 = 0 ;
+b0 = 1 ;
+If = (0.5*10^-3)*(b0+2^-1*b1+2^-2*b2) ;
+disp('for the binary input 101 analog output is = '+string(If)+ ' A ');
+
+// An analog output voltage Vo is
+Vo = -If*Rf ;
+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');
+
+
+// for the binary input 011 the feedback current If is given by
+b2 = 0 ;
+b1 = 1 ;
+b0 = 1 ;
+If = (0.5*10^-3)*(b0+2^-1*b1+2^-2*b2) ;
+disp('for the binary input 011 analog output is = '+string(If)+ ' A');
+
+// the An analog output voltage Vo is
+Vo = -If*Rf ;
+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');
+
+
+// for the binary input 100 the feedback current If is given by
+b2 = 1 ;
+b1 = 0 ;
+b0 = 0 ;
+If = (0.5*10^-3)*(b0+2^-1*b1+2^-2*b2) ;
+disp('for the binary input 100 analog output is = '+string(If)+ ' A ');
+
+// the An analog output voltage Vo is
+Vo = -If*Rf ;
+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');
+
+// for the binary input 001 the feedback current If is given by
+b2 = 0 ;
+b1 = 0 ;
+b0 = 1 ;
+If = (0.5*10^-3)*(b0+2^-1*b1+2^-2*b2) ;
+disp('for the binary input 001 analog output is = '+string(If)+ ' A ');
+
+// the An analog output voltage Vo is
+Vo = -If*Rf ;
+disp('An analog output voltage Vo is = '+string(Vo)+ ' V ');
+