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+// Example 5.20:mid band gain and upper 3 db frequency
+clc;
+clear;
+close;
+Cpi=40;//in pico farad
+Vt=26;//voltage in milli volts
+Beta=150;//
+Icc=1;//current in milli ampere
+rpi= ((Beta*Vt)/Icc)*10^-3;//
+Icq=1;//current in milli ampere
+gm=(Icq/Vt)*10^3;//transconductance in mili ampere per volt
+Rc=4.7;//collector resistance in killo ohms
+Rl=10;//load resistance in killo ohms
+Rld= (Rc*Rl)/(Rc+Rl);//
+Cmu=3;//capacitance in pico farad
+Cm=round(Cmu*(1+gm*Rld));//miller capacitance in pico farad
+R1= 50;// in kilo ohms
+R2= 5;// in kilo ohms
+Rb= (R1*R2)/(R1+R2);
+rs=1;//in killo ohms
+x=(Rb*rs)/(Rb+rs);//
+y=(rpi*x)/(rpi+x);//
+fh=(1/(2*%pi*y*10^3*(Cmu+Cpi)*10^-6));//3-db upper cut off frequency in mega hertz
+z=(Rb*rpi)/(Rb+rpi);//
+Avm=(gm*Rld*z)/(z+rs);//
+disp(fh,"3-db upper cut off frequency in mega hertz is")
+disp(Avm,"MIDBAND GAIN")