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+// Example 5.9:3-db frequency and bandwidth
+clc;
+clear;
+close;
+Cp=1;//PARALLEL capacitance IN PICO FARAD
+Cs=2;//series capacitance IN micro FARAD
+rs=1;//series resistance in killo ohms
+rp=2;//PARALLEL resistance in killo ohms
+ts= ((rs+rp)*10^3*Cs*10^-6);//time constant
+tp= ((rs*rp)/(rs+rp)*Cp*10^-12);//time constant
+fl= (1/(2*%pi*ts));//lower frequency in  hertz
+fh= (1/(2*%pi*tp));//upper frequency in  hertz
+BW=fh-fl;//bandwidth in  hertz
+ts= (rs+rp)*10^3*Cs*10^-12;//time constant
+disp(ts," time constant in second is")
+disp(fl,"lower 3 dB frequency in  hertz")
+disp(fh,"upper 3 dB frequency in  hertz")
+disp(BW,"bandwidth in hertz is")