diff options
Diffstat (limited to '3754/CH24/EX24.5/24_5.sce')
| -rw-r--r-- | 3754/CH24/EX24.5/24_5.sce | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/3754/CH24/EX24.5/24_5.sce b/3754/CH24/EX24.5/24_5.sce new file mode 100644 index 000000000..613ac9d1b --- /dev/null +++ b/3754/CH24/EX24.5/24_5.sce @@ -0,0 +1,29 @@ +clear//
+
+//Variables
+
+VCC = 30.0 //Source voltage (in volts)
+RC = 10.0 //Collector resistance (in kilo-ohm)
+RE = 8.2 //Emitter resistance (in kilo-ohm)
+RL = 3.3 //Load resistance (in kilo-ohm)
+beta = 200.0 //Common emitter current gain
+VBE = 0.7 //Emitter-to-Base Voltage (in volts)
+R1 = 47.0 //Resistance (in kilo-ohm)
+R2 = 15.0 //Resistance (in kilo-ohm)
+Vs = 5.0 //a.c voltage (in milli-volts)
+
+//Calculation
+
+Vth = VCC * R2 / (R1 + R2) //Thevenin's voltage (in volts)
+Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent voltage (in volts)
+IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
+r1e = 25.0 / IE //a.c. resistance of emitter diode (in ohm)
+rL = RC * RL/(RC + RL) //a.c load seen by the amplifier (in kilo-ohm)
+Av = rL * 10**3 / r1e //Voltage gain
+vo = Av * Vs //Output voltage (in volts)
+Ri = beta * r1e * 10**-3 //Input resistance looking directly into the base (in ohm)
+Ris = Rth * Ri / (Rth + Ri) //input resistance of the stage (in ohm)
+
+//Result
+
+printf("\n a.c output voltage is %0.2f mV.\nInput impedance for the circuit is %0.0f kilo-ohm.",vo,Ris)
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