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clear//
//Variables
VCC = 20.0 //Source voltage (in volts)
RC = 5.7 //Collector resistance (in kilo-ohm)
RE = 1.0 //Emitter resistance (in kilo-ohm)
beta = 100.0 //Common emitter current gain
VBE = 0.7 //Emitter-to-Base Voltage (in volts)
R1 = 100.0 //Resistance (in kilo-ohm)
R2 = 10.0 //Resistance (in kilo-ohm)
Vs = 10.0 * 10**-3 //a.c voltage (in volts)
RS = 100.0 * 10**-3 //Source resistance (in kilo-ohm)
//Calculation
Vth = VCC * R2 /(R1 + R2) //Thevenin's voltage (in volts)
Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent resistance (in kilo-ohm)
IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
r1e = 25.0 / IE * 10**-3 //a.c. resistance of emitter diode (in kilo-hm)
Ris = Rth * beta*r1e/(Rth + beta*r1e) //input resistance of the stage (in ohm)
rL = RC //Load resistance (in kilo-ohm)
Av = rL / r1e //Voltage gain
vin = Vs * Ris / (Ris + RS) //input voltage (in milli-volts)
vo = Av * vin //Output voltage (in milli-volts)
Avs = Av * vin / Vs //Overall voltage gain
//Result
printf("\n Av is %0.3f .\nRi is %0.2f ohm.\nVo is %0.2f V.\nAvs is %0.2f .",Av,Ris*10**3,vo,Avs)
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