You can replace the amplifier in the model by any other RF Blockset system and measure its noise figure. To validate that the simulated measured noise figure corresponds to theoretical values, specify a reference impedance from the Smith chart, using the Specify Source Impedance subsystem. To control the complex value of this source impedance, double-click the Specify Source Impedance subsystem, and specify the desired value in the edit box. The initial data cursor position corresponds to a point on a noise circle that is closest to the source impedance specified. The Smith chart is interactive and you can place the data cursor on any circle to view the corresponding noise figure, source impedance (normalized to the reference impedance of the amplifier, Z0), and other RF properties. The values shown in the Smith chart represent the expected noise figures obtained theoretically from the parameters specified in the amplifier.
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