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+//Chapter 5
+//page 135
+//Example no 5-2
+//Given 
+clc;
+clear;
+Rf=10000;       //in Ohm
+Ri=2000;        //in Ohm
+Av=-Rf/Ri;
+printf("\n Av  = %.0f ",Av);//Result
+Av1=20*log10(-Av);
+printf("\n Av in %.0f bB",Av1);//Result
+//for noise gain 
+An=1+Rf/Ri;
+printf("\n Anoise =%.0f ",An);  //Result