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+// Example 5.22:mid band gain and upper 3 db frequency
+clc;
+clear;
+close;
+Cmu=3;//capacitance in pico farad
+Cpi=40;//in pico farad
+Vt=26;//voltage in milli volts
+Beta=150;//
+Icq=1;//current in milli ampere
+rpi= ((Beta*Vt)/Icq)*10^-3;//
+gm=(Icq/Vt)*10^3;//transconductance in mili ampere per volt
+rs=1;//in killo ohms
+re=4.7;//in killo ohms
+R1= 40;// in kilo ohms
+R2= 20;// in kilo ohms
+R3= 27;// in kilo ohms
+Rb=(R2*R3)/(R2+R3);//
+g=(rs*rpi)/(rs+rpi);//
+tp1=(((Rb*g)*(Cpi+2*Cmu))/(Rb+g))*10^-9;//in second
+m=rpi/(1+Beta);//
+tp2= m*(Cmu+Cpi)*10^-9;//
+Rc=4.7;//collector resistance in killo ohms
+Rl=10;//load resistance in killo ohms
+Rld= (Rc*Rl)/(Rc+Rl);//
+tp3=Cmu*10^-12*Rld*10^3;//in second
+fh1=(1/(2*%pi*tp1*10^6));//first 3-db upper cut off frequency in mega hertz
+fh2=(1/(2*%pi*tp2*10^6));//second 3-db upper cut off frequency in mega hertz
+fh3=(1/(2*%pi*tp3*10^6));//third 3-db upper cut off frequency in mega hertz
+Avm= -gm*Rld*(rpi/(rpi+1));//
+disp(fh1,"3-db upper cut off frequency in mega hertz is")
+disp(fh2,"second 3-db upper cut off frequency in mega hertz")
+disp(fh3,"third 3-db upper cut off frequency in mega hertz")
+disp(Avm,"MIDBAND GAIN")
+