diff options
Diffstat (limited to '3754/CH24/EX24.11/24_11.sce')
| -rw-r--r-- | 3754/CH24/EX24.11/24_11.sce | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/3754/CH24/EX24.11/24_11.sce b/3754/CH24/EX24.11/24_11.sce new file mode 100644 index 000000000..dac9e9394 --- /dev/null +++ b/3754/CH24/EX24.11/24_11.sce @@ -0,0 +1,33 @@ +clear//
+
+//Variables
+
+VCC = 10.0 //Source voltage (in volts)
+RC = 5.0 //Collector resistance (in kilo-ohm)
+rE = 500 * 10**-3 //Emitter resistance (in kilo-ohm)
+beta = 50.0 //Common emitter current gain
+VBE = 0.7 //Emitter-to-Base Voltage (in volts)
+R1 = 50.0 //Resistance (in kilo-ohm)
+R2 = 10.0 //Resistance (in kilo-ohm)
+Vs = 100.0 * 10**-3 //a.c voltage (in volts)
+RS = 600.0 * 10**-3 //Source resistance (in kilo-ohm)
+RL = 50.0 //Load resistance (in kilo-ohm)
+RE1 = 500.0 * 10**-3 //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)
+RE = RE1 + rE //Emitter total resistance (in kilo-ohm)
+IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
+r1e = 25.0 / IE * 10**-3 //a.c. resistance (in kilo-ohm)
+Ri = beta * (rE + r1e) //Input resistance directly into the base (in kilo-ohm)
+Ris = Rth * Ri/(Rth + Ri) //Input resistance of the stage (in kilo-ohm)
+rL = RC * RL / (RC + RL) //a.c. load resistance (in kilo-ohm)
+Av = rL/(rE + r1e) //Voltage gain
+Avs = Av * Ris / (RS + Ris) //Overall voltage gain
+Vo = Avs * Vs //Output voltage (in volts)
+
+//Result
+
+printf("\n Input resistance looking directly into the base is %0.1f kilo-ohm.\nInput resistance of the stage is %0.2f kilo-ohm.\nVoltage gain is %0.3f .\nOverall voltage gain is %0.2f .\nOutput voltage is %0.2f V.",Ri,Ris,Av,Avs,Vo)
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