Creating a Multisim Component from the Analog Behaviour Model (ABM) Functions

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The ABM source is a powerful component that allows users to create a voltage or current source based on a mathematical or conditional expression.  For those who are not familiar with SPICE syntax, you can open the attached Multisim file to view the expressions offer in NI Multisim.  You can copy/paste the functions you need and connect them together to create your custom expression.

Creating a component using the ABM expressions allow you to reuse the expression in the same circuit without re-entering and also, it makes the schematic easier to read since the expression inputs are wired together.  To view the model, double-click on a component and then click Edit Model button.  The model consists of three lines; a .suckt statement, the expression and an .ends statement.  By viewing the attached examples, hopefully, you will understand how you can use the ABM expressions to create a complex custom component.

Create a Custom Component Tutorial

The attached Multisim library was created in Multisim 12, if you want to add these parts to your database, select Tools» Database» Merge Database. If you are using newer version, use the database convert option instead.

For more information about the AMB source, refer to the Analog Behaviour Model Source white paper