RF Blockset 2.5

Intermodulation Analysis of Physical Amplifier

This model illustrates how to perform intermodulation analysis of a physical amplifier block using the General Amplifier block. 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.

Contents

Demo Model

Fig. 1 Physical amplifier intermodulation demo model:

Simulation Results

Fig. 2 shows the spectrum of the two-tone input signal:

The following figure shows the spectrum of the amplifier's output signal of the amplifier. 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.