diff options
Diffstat (limited to '3754/CH24/EX24.8/24_8.sce')
| -rw-r--r-- | 3754/CH24/EX24.8/24_8.sce | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/3754/CH24/EX24.8/24_8.sce b/3754/CH24/EX24.8/24_8.sce new file mode 100644 index 000000000..f8298daab --- /dev/null +++ b/3754/CH24/EX24.8/24_8.sce @@ -0,0 +1,27 @@ +clear//
+
+//Variables
+
+VCC = -18.0 //Source voltage (in volts)
+RC = 4.3 //Collector resistance (in kilo-ohm)
+RE = 1.0 //Emitter resistance (in kilo-ohm)
+beta = 200.0 //Common emitter current gain
+VBE = -0.7 //Emitter-to-Base Voltage (in volts)
+R1 = 39.0 //Resistance (in kilo-ohm)
+R2 = 8.2 //Resistance (in kilo-ohm)
+RL = 3.0 //Load resistance (in kilo-ohm)
+
+//Calculation
+
+Vth = VCC * R2 / (R1 + R2) //Thevenin's voltage (in volts)
+Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent voltage (in volts)
+IC = (Vth - VBE)/(RE + Rth/beta) //Collector current (in milli-Ampere)
+IE = -IC //Emitter current (in milli-Amper)
+r1e = 30.0/IE * 10**-3 //a.ac resistance (in kilo-ohm)
+Ris = Rth * beta*r1e/(Rth + beta*r1e) //input resistance of the stage (in ohm)
+rL = RC * RL / (RC + RL) //a.c. load resistance (in kilo-ohm)
+Av = rL / r1e //Voltage gain
+
+//Result
+
+printf("\n Voltage gain is %0.1f .",Av)
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