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+// Exa 8.9
+clc;
+clear;
+close;
+//given data
+V_REF= 10;// in V
+MSB2= V_REF/2;// in volt
+disp(MSB2,"The second MSB weight in volt")
+MSB3= V_REF/4;// in volt
+disp(MSB3,"The third MSB weight in volt")
+MSB4= V_REF/8;// in volt
+disp(MSB4,"The forth MSB (or LSB) weight in volt")
+DAC= MSB4;
+disp(DAC,"The resolution of the DAC in volt")
+FullScaleOutput= V_REF+MSB2+MSB3+MSB4;//in volt
+disp(FullScaleOutput,"Full scale output in volt");
+disp("If Rf is reduced to one-forth, each input will be 4 times smaller than the values above. Thus the full scale output will be reduced")
+disp(" in the same ratio and becomes "+string(FullScaleOutput/4)+" volt")