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3.2 Subcircuit and Device Model Definition 195
Internally, all model selectors are converted to strings. Therefore, Selector−>symbol and
Selector−>ToString[symbol] are equivalent selector specifications.
Likewise, you can specify the selector in a model reference (see Section 3.1.8) either as a
symbol or a string regardless of the data type used in the model definition.
Scope
Scope−>Local
Scope−>Global
restrict the visibility of the model definition to the
surrounding Circuit object
store the model definition in the global subcircuit database
Format of the Scope argument.
The optional argument Scope determines the scope of the model definition. With the default setting
Scope −> Local, the model can only be referenced from Netlist objects inside the Circuit object
that contains the corresponding Model statement. With Scope −> Global, the model is stored in the
global subcircuit database and can be accessed by other Circuit objects.
You can use the Scope mechanism to implement a library of frequently used device models separately
from any top-level circuit description and load the models into Analog Insydes’ global subcircuit
database. This can be accomplished by implementing a set of models in a Mathematica *.m file as
illustrated below.
(* Begin MyModels.m *)
Circuit[
Model[Name −> "BJT", Selector −> "AC", Scope −> Global,
Definition −> ],
Model[Name −> "MOSFET", Selector −> "AC", Scope −> Global,
Definition −> ],
] // ExpandSubcircuits;
(* End MyModels.m *)
The library file "MyModels.m" can then be loaded using the command Get["MyModels.m"].
See also: GlobalSubcircuits (Section 3.3.4), RemoveSubcircuit (Section 3.3.8).