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3.4 Expanding Subcircuits and Device Models 225
DefaultSelector
With the option DefaultSelector, you can specify the key used by ExpandSubcircuits to replace
the right-hand sides of generic device model selector specifications in netlists generated with
ReadNetlist (Section 3.10.1). The setting DefaultSelector −> selector causes all generic selectors
to be replaced by the key selector. Possible values are:
None
"string"
symbol
do not use a default value for generic model selectors
use "string" as default model selector
use SymbolName[symbol] as default model selector
Values for the DefaultSelector option.
With the setting DefaultSelector −> None, ExpandSubcircuits will print an error
message and abort upon encountering a generic Selector specification.
Usually ExpandSubcircuits is automatically called by CircuitEquations which sets the
DefaultSelector option to an appropriate value based on the chosen analysis mode.
HoldModels
With HoldModels −> patterns, you can specify a list of Mathematica patterns matching the names and
selectors of model references ExpandSubcircuits should not expand. Note that the application of
the HoldModels option is only necessary for advanced tasks. Usually there is no need to use this
option.
A practical application of the HoldModels option is to stop expansion of a hierarchical circuit
description at the device level. The function ReadNetlist (Section 3.10.1) makes use of this feature
to assign small-signal data read from a simulator output file to individual devices in a circuit which
contain subcircuit definitions. The following values are allowed:
pattern
{pattern
, pattern
}
{{pattern
, pattern
}, † † † }
do not expand model references whose name specification
matches pattern
do not expand model references whose name specification
matches pattern
and whose selector specification matches
pattern
do not expand model references that match at least one of
the pattern pairs
Values for the HoldModels option.