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diff --git a/1757/CH11/EX11.4/EX11_4.sce b/1757/CH11/EX11.4/EX11_4.sce
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+//Example11.4   // determine the number of bit required to design a 4-bit D/A converter
+clc;
+clear;
+close;
+VFS = 5 ;
+Resolution = 10*10^-3 ; // A
+
+// the resolution of 4-bit D/A converter is defined as
+// Resolution = VFS/(2^N-1) ;
+N = (VFS/Resolution)+1 ;   
+N = log10(N)/log10(2);
+disp('the number of bit required to design a 4-bit D/A converter is = '+string(N)+ '   = 9 ');
+