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diff --git a/3637/CH4/EX4.5/Ex4_5.sce b/3637/CH4/EX4.5/Ex4_5.sce
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+//problem 5 pagenumber 4.39
+//given
+fs=1e3;//hz
+r=0.01;format(6);
+vref=10;//volt
+//determine n vmin rms fs1 t1 z
+r=0.01/100;
+n=14;
+mbit=2^n;
+disp('Minumum number of bits = '+string((mbit)));
+vm=vref/2^n;
+disp('Minmum voltage = '+string(vm*10^6)+' μvolt');
+eq=vref/(2^n*2*sqrt(3)); 
+disp('Quantization error = '+string(eq*10^6)+' μvolt');
+fs1=5*fs;
+disp('Sampling rate = '+string(fs1)+' Hz');
+t1=1/(2*%pi*fs*2^n);
+disp('Aperture time = '+string(t1*10^6)+' milisecond');//error in book
+disp('Converter = '+string(6*n)+' dB');