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+// Example 11.7
+// Design of an Active Filter
+f_l=200;
+f_u=4000;
+// f_l=1/(2*%pi*R1*C1) and f_u=1/(2*%pi*R_F*C_F)
+// which limits the value of capacitance to
+// 5nF<C_1<500nF and 0.25nF<C_F<25nF
+// R_F= 1/(omega_u*C_F) and R_1=1/(omega_l*C_1)
+// K=C_1/(20*C_F)
+// thus i can increase the midband gain by taking large value for C_1 and small value for C_F
+// thus we choose standard values for capacitors
+C_1= 100*10^-9;
+C_F=1*10^-9;
+R_1=1/(2*%pi*f_l*C_1);
+R_F=1/(2*%pi*f_u*C_F);
+//Which gives
+K=R_F/R_1;
+disp("Required value for resistors are(in Ohms)")
+disp(R_1,"R_1=")
+disp(R_F,"R_F=")