This model shows how to perform intermodulation analysis of an amplifier using the General Amplifier block from the SimRF™ Equivalent Baseband library. The parameters of the General Amplifier block are specified in an S2D data file, default.s2d. The data file contains the S-parameters of an amplifier at frequencies ranging from 1.0 GHz to 2.9 GHz. It also contains power-dependent S21 data at 2.1 GHz.
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Fig. 1 Equivalent Baseband amplifier intermodulation example model:
Fig. 2 The equivalent baseband spectrum of the two-tone input signal over the frequency range 1.9 GHz (-200 MHz) to 2.3 GHz (200 MHz):
The following figure shows the equivalent baseband spectrum of the output signal of the amplifier over the frequency range 1.9 GHz (-200 MHz) to 2.3 GHz (200 MHz). You can see the intermodulation generated by the amplifier's nonlinearity.
Fig. 3 Two-tone output:
To view the intermodulation performance at the output, double-click the Slider Gain block and change the gain while the model is running.