Subcircuits and Models

To prepare to simulate using a SPICE or Spectre language model, you must give the elaborator the location of the model file. Two ways you can specify the location of model files are as follows:

• Define the MODELPATH variable in the hdl.var

• Use the -modelpath option for xmelab

To include a subcircuit in your design, use an amsd block and reference subcircuit files.

If you have an undefined node in a subcircuit, you must declare that node using an explicit global statement in the top-level scope of your design. For example, the following statement declares two global signals:

global 0 gnd vdd!

Related Topics

• Analog Primitives and Subcircuits