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192 3. Reference Manual
3.2 Subcircuit and Device Model Definition
This chapter describes the usage of the command Model (Section 3.2.1), which enables you to
describe your circuits hierarchically in terms of subcircuits and device models. In the following
sections, Analog Insydes’ subcircuit and device modeling functionality is presented mainly from
the perspective of language syntax. Therefore, it is recommended that you also read Chapter 2.3
and Chapter 2.6 of the Analog Insydes Tutorial to understand the philosophy behind the modeling
language and learn more about methodologies for modeling linear and nonlinear circuits and devices.
Analog Insydes provides a unified modeling scheme that lets you implement and instantiate both
subcircuits and device models in exactly the same way. Therefore, the terms model and subcircuit shall
be treated as synonyms throughout this chapter. Whenever the word model is used in the following
text, it may refer to a component of a hierarchically structured circuit as well as to an equivalent
circuit or set of equations that describes a physical device. Consequently, the Analog Insydes
command Subcircuit is just an alias for Model, and you may use both names interchangeably.
3.2.1 Model
Model[keyword
−>value , keyword
−>value , † † † ]
defines a subcircuit or device model in terms of a netlist or
a system of behavioral equations
Command structure of Model.
Subcircuits and device models can be implemented either as netlists, i.e. as equivalent circuits
composed of electrical primitives and model references (see Section 3.1.3), or as behavioral descriptions
in terms of linear and nonlinear algebraic and differential equations. Both equivalent circuits and
analog behavioral models (ABMs) can be defined with the Model command. Model takes a sequence of
named arguments, four of which are required while the remaining arguments are optional.
Name
Selector
Ports
Definition
the model class name
the selector for a particular member from a model class
the list of model port nodes
the model definition (a netlist or a system of equations)
Required arguments of the Model command.