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3.2 Subcircuit and Device Model Definition 201
argument allows you to assign alias names to model parameters which will appear in symbolic
circuit equations in place of the original names.
For example, the following declaration causes the symbol R to be used instead of the original
model parameter name RES whenever you set up symbolic circuit equations with the above model
definition.
Symbolic −> {RES −> R}
Variables
Variables−>{varspec
, varspec
, † † † }
specify the identifiers which represent unknowns in a set
of model equations
Format of the Variables argument.
The Variables argument is used only in conjunction with analog behavioral model definitions. It
serves to declare the identifiers in a set of model equations which represent the unknowns. The
identifiers have to be of the following form:
symbol
declare symbol as an internal model variable
Voltage[port
, port
] or Current[port
, port
]
declare a model variable as a branch voltage or branch
current
Values for the variable specification varspec.
For each port branch you must declare both the branch voltage and the branch current as
model variables, even in cases where one of the two does not appear explicitly in the
equations.