== Running an AC Frequency Sweep Test of the BJT Amplifier ==
In the last part of this tutorial lesson, you will run an AC Sweep Test of your BJT amplifier circuit to examine the input and output voltages and find the voltage gain and power gain of your amplifier. First, you need to put back the AC voltage source VS, the source resistor R2 and the load resistor R1 in your amplifier circuit.
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In the last part of this tutorial lesson, you will run an AC Sweep Test of your BJT amplifier circuit to examine the input and output voltages and find the voltage gain and power gain of your amplifier. To measure the power gain, we define input and output powers as the source and load powers:
<math> P_{in} = P_S = \frac{1}{2} R_S |I_S|^2 </math>