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clear//
//Variables
VCC = 10.0 //Source voltage (in volts)
RE = 1.5 * 10**3 //Emitter resistance (in ohm)
R1 = 30.0 * 10**3 //Resistance (in ohm)
R2 = 20.0 * 10**3 //Resistance (in ohm)
beta1 = 150.0 //Common emitter current gain
beta2 = 100.0 //Common emitter current gain
VBE = 0.7 //Emitter-to-base voltage (in volts)
//Calculation
Ai = beta1 * beta2 //Overall current gain of transistor
VR2 = VCC * R2/(R1 + R2) //Voltage across resistor2 (in volts)
VB2 = VR2 - VBE //Voltage at the base of Q2 (in volts)
VE2 = VB2 - VBE //Voltage at the emitter of Q2 (in volts)
IE2 = VE2 / RE //Emitter current of Q2 (in Ampere)
r1e2 = 25.0/IE2 * 10**-3 //a.c. emitter diode resistance of Q2 (in ohm)
IB2 = IE2 / beta2 //Base current of Q2 (in Ampere)
IE1 = IB2 //Emitter current of Q2
r1e1 = 25.0/IE1 * 10**-3 //a.c. emitter diode resistance of Q1 (in ohm)
Ri1 = R1 * R2/(R1 + R2) //Total input resistance (in ohm)
Av = RE/(r1e1/beta2 + r1e2 + RE) //Overall voltage gain
//Result
printf("\n The overall current gain is %0.3f .",Ai)
printf("\n The a.c. emitter diode resistance of Q1 transistor is %0.1f ohm.\nThe a.c. emitter diode resistance of Q2 transistor is %0.2f ohm.",r1e1,r1e2)
printf("\n Total input resistance is %0.3f kilo-ohm.",Ri1 * 10**-3)
printf("\n Overall voltage gain is %0.2f .",Av)
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