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You can use a subcircuit to pass parameters to models. The following is an example of passing a parameter
to a resistor model:
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The w you assign to the property of the resistor instance in the schematic will override the default value
for w, which is 2u (this will also work for a design variable). If you didn’t assign any value to the resistor
instance, then the model will take the default value of 2u for w. Using the inline subcircuit, each instance
of the resistor component will have a unique model with unique w and etch values. For each instance of the
component, the model name assigned should be the inline subcircuit name ppolyns.
See spectre -h subckt for more information.
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In IC 4.4.3 and above, you may run a standalone utility called SPP for converting Hspice commands into
Spectre syntax. The syntax is
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Be aware that it will not convert model parameters and you need to check the validity of the models in
Spectre.
The following is a mapping of the command options that are converted:
SPICE/Hspice Spectre
.alter alter, altergroup
.param parameters
.lib library/section
.data paramset
.print/.plot save
.meas using OCEAN functions
Refer to Chapter 3, SSpice Compatibility,öf the Spectre Circuit Simulator User Guide for more information.
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