All content Copyright 2022 Parallel Systems Ltd.

 

Reference Schematic:

It is possible to reference the voltage at a node, a voltage differential between two nodes, and the current through a device in the expression of an ABM device.

In this example you will see that even though there are no inputs connected to the ABM symbol, it is still functional. This is extremely useful if the output of the device is dependent upon more than just a differential voltage. This allows the Evalue and Gvalue to become powerful, flexible, and have a more general application than the E, F, G, and H devices defined in SPICE.

 

1. Place resistor R2 and connect as shown above.

 

2. Disconnect pin IN+ of Evalue from the source by selecting and deleting the wire.

 

3. Short the IN+ pin of E1 to ground.

 

4. Assign a net alias of IN to the node between V1 and R2.

 

5. Edit the EXPRESSION property of E1 to reference the voltage at node VIN instead of the voltage seen across the two input pins of E1. The value of the expression will be ABS(V(IN))*GAIN.

 

6. Run the simulation and view the results.

The results are the same for both circuits although the referenced voltage is not wired directly to the controlled source.

 

 

End of Lab

 

 

All content Copyright 2022 Parallel Systems Ltd.