Programming instructions

ABM Sources
 National Instruments Corporation 1-49 Multisim Component Reference Guide
Channel data, or click OK to accept the default settings.
•
Preview Data — select to view the file’s contents in the Value tab.
•
Reload File — click to reload the file when the .lvm file has been edited and you wish
to reflect the changes in the LVM Source.
•
Repeat — enable to continuously run the file during simulation. If this checkbox is not
enabled, output from the source will cease once the final data pair has been read.
3. In the Channel area:
•
Select Channel — displays the Select Trace dialog box where you can edit the Section
and
Channel settings.
•
Section — displays the selected section.
•
Channel — displays the selected channel.
4. Click OK to close the source’s properties dialog.
1.45 ABM Sources
ABM (analog behavioral model) sources use mathematical and conditional expressions to set
their output voltage or current. They may contain mathematical and conditional expressions
that consist of circuit voltages, currents, time and other simulation parameters.
 To enter an expression in a current or voltage ABM source:
1. Double-click on the placed component ABM source and click the Value tab.
2. Enter the expression in the Current Value (in current sources) or Voltage Value (in voltage
sources) field.
The example circuit below is an ABM current source with value
2*0.001/(3.3-1)*(V(gate)-V(source)):
Expressions may use node voltages relative to ground using the syntax
V(<net name>),
where
<net name> is the name of a net. Alternatively, expressions may use differential
node voltages using the syntax
V(<net name1>, <net name2>), where the expression
evaluates to the difference between nets
<net name1> and <net name2>.
ComponentRef.book Page 49 Thursday, December 7, 2006 10:12 AM