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diff --git a/1583/CH3/EX3.12/NNID_Ex_3_12.sce b/1583/CH3/EX3.12/NNID_Ex_3_12.sce
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+clc
+//Chapter 3:Network noise and intermodulation distortion
+//example 3.12 page no 89
+//given
+ensqr=8*10^-16//noise voltage
+insqr=9*10^-25//rms noise current
+Rs=9.42*10^3//sourse resistance
+k=1.38*10^-23//Boltzmmans constant
+T=290//tempreture
+N=ensqr+insqr*Rs^2+4*k*T*Rs//total noise
+disp(N,'the total noise is ')
+disp('If the sourse resistance is zero,the total noise is ')
+disp('N=ensqr=8*10^-16')
diff --git a/1583/CH3/EX3.12/Result_of_Chapter_3_Ex3_12.jpg b/1583/CH3/EX3.12/Result_of_Chapter_3_Ex3_12.jpg
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