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//Example11.9 // determine the analog output voltage and feed back current If
clc;
clear;
close;
Vref = 10 ;
BI = 1001 ; BI = 1100 ; BI = 1010 ; BI = 0011 ;
Rf = 50 ; // K ohm
R = 0.4*Rf ;
// The output voltage of given R-2R ladder D/A converter is defined as
// Vo = -(Rf*Vref/2R)*(2^0*b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
// Vo = -(Rf*Vref/2R)*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
// for the given value Rf,R and Vref the output voltage
// Vo = -12.5*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
// for the binary input 1001 analog output is
b3 = 1 ;
b2 = 0 ;
b1 = 0 ;
b0 = 1 ;
Vo = -12.5*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
disp('for the binary input 1001 analog output is = '+string(Vo)+ ' V ');
// the feedback current If is given by
If = -(Vo/Rf) ;
disp('the feedback current If is = '+string(If)+ ' mA ');
// for the binary input 1100 analog output is
b3 = 1 ;
b2 = 1 ;
b1 = 0 ;
b0 = 0 ;
Vo = -12.5*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
disp('for the binary input 1100 analog output is = '+string(Vo)+ ' V ');
// the feedback current If is given by
If = -(Vo/Rf) ;
disp('the feedback current If is = '+string(If)+ ' mA ');
// for the binary input 1010 analog output is
b3 = 1 ;
b2 = 0 ;
b1 = 1 ;
b0 = 0 ;
Vo = -12.5*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
disp('for the binary input 1010 analog output is = '+string(Vo)+ ' V ');
// the feedback current If is given by
If = -(Vo/Rf) ;
disp('the feedback current If is = '+string(If)+ ' mA ');
// for the binary input 0011 analog output is
b3 = 0 ;
b2 = 0 ;
b1 = 1 ;
b0 = 1 ;
Vo = -12.5*(b0+2^-1*b1+2^-2*b2+2^-3*b3) ;
disp('for the binary input 0011 analog output is = '+string(Vo)+ ' V ');
// the feedback current If is given by
If = -(Vo/Rf) ;
disp('the feedback current If is = '+string(If)+ ' mA ');
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