diff options
Diffstat (limited to '3754/CH24/EX24.9/24_9.sce')
| -rw-r--r-- | 3754/CH24/EX24.9/24_9.sce | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/3754/CH24/EX24.9/24_9.sce b/3754/CH24/EX24.9/24_9.sce new file mode 100644 index 000000000..adb6c6446 --- /dev/null +++ b/3754/CH24/EX24.9/24_9.sce @@ -0,0 +1,30 @@ +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)
|