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+//chapter 3
+//example 3.9
+//page 137
+R1=120*10^3;Rf=1.2*10^6;Cf=10*10^-9// given
+fa=1/(2*%pi*Rf*Cf);// corner frequency
+F=10*10^3;
+Vin=5;
+disp(fa)//coner frequency
+safefrequency=10*fa//safe frequency is 10 times of corner frequency
+Adc=Rf/R1;//D.C gain
+Adb=20*log10(Adc)// gain in db
+A=(Rf/R1)/sqrt(1+(F/fa)^2)//gain for practical intregrater circuit
+disp(A)
+Vout=A*Vin;//|A|=Vout(peak)/Vin(peak)
+disp(Vout)
+\ No newline at end of file