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+//Ex 3.9
+clc;clear;close;
+format('v',6);
+fo=1.2;//kHz
+alfa=1.414;//for butterworth filter
+Ap=3-alfa;//band pass gain
+RfBYRi=(Ap-1);//op-amp gain
+C=0.03;//micro F(have to choose C, 0.01<C<1)
+R=1/(2*%pi*fo*10^3*C*10^-6)/1000;//kohm
+//For offset minimization 2*R=Rf||Ri
+Rf=2*R*RfBYRi+2*R;//kohm
+Ri=Rf/RfBYRi;//kohm
+disp("Design values are :");
+disp(C,"Capacitance(micro F)");
+disp(R,"Resistance R(kohm)");
+disp(Rf,"Resistance Rf(kohm)");
+disp(Ri,"Resistance Ri(kohm)");