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This example shows a common use case and setup procedure for a system level load pull simulation. This analysis should be used to look at system level characterizations, ACPR or EVM for example, while preforming load pull analysis on a specific device in the system chain such as a power amplifier. The setup of the project is slightly more involved and outlined below. Furthermore, there are setup instructions located on both the Load_Pull_System_Template and the circuit/device Load_Pull_Template. Note that both the circuit and system simulators must be run to populate all graphs.

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Overview

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•    Add a system load pull template by choosing Scripts > Load Pull > Create_System_Load_Pull_Template (A circuit load pull template will be added automatically if one does not already exist)

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•    Follow the directions on both the system and circuit load pull templates to configure them correctly.

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•    Set up the system level characterization measurements. For example, ACPR and EVM, are show in this example. A few caveats below:

o Measurements must have the F1 variable set to Use for x-axis

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o Measurements must plot a single trace per sweep, and thus waveform measurements are not load pull compatible.

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•    After the system and circuit load pull templates are configured run load pull using Scripts > Load Pull > Load_Pull

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•    Follow the on screen dialog to set up the load pull parameters (very similar to the circuit load pull setup)

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•    After the load pull simulation the load pull data will show up as a data file under the Data Files node in the project browser. The data can be plotted using the new load pull measurements (Load Pull > G_******)

Load_Pull_System_Template

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