Run a Network Analysis Test of the true amplifier circuit independent of the source and load with the [[parameters]] specified below:
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{| class="wikitable"
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! scope="row"| Start Frequency
| 500Meg
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! scope="row"| Stop Frequency
| 1500Meg
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! scope="row"| Steps/Interval
| 10Meg
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! scope="row"| Interval Type
| Linear
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! scope="row"| Parameter Set
| S
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! scope="row"| Graph Type
| Cartesian (Amplitude) with Decibels
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The figure below shows the results for S11, S21, S12 and S22 [[parameters]].
Run a network analysis of this circuit with start and stop frequencies set at 500MHz and 1500MHz and with a linear frequency step size of 10MHz. Plot the S-[[parameters]] on an amplitude-only Cartesian graph. The figure below shows the results for s11, s21, s12 and s22 [[parameters]]. A tracking crosshair has been used to read the value of |s21| at 1GHz. This value is 815.02dB4dB. Note that the total input reflection coefficient and the total output reflection coefficient are both below -10dB at 1GHz and the overall |s12| of the circuit is negligible. Run an AC Network Analysis Test of this modified circuit with the exactly the same settings as in the previous case. The results are shown in the figure below. Note how the value of |s21| at 1GHz has jumped to 15.385dB this time around, while the total input and output reflection coefficients are still both below -10dB. This validates your design strategy based on the unilateral assumption. You will see in the next section that the computed values of |s21| (insertion loss or gain) is very close to the computed value of the power gain from the source to the load.
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[[File:RF134.png|thumb|750px|The graph of magnitude of s11S11, s21S21, s12 S12 and s22 S22 parameters of the BJT amplifier circuit without the source and load sections.]]
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