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Chapter 5 Subcircuit Definition
E'
5.1 Ebers-Moll model of an NPN transistor: (a) Circuit symbol, (b) the
Ebers-Moll model. Note: B', C', and E' are the internal nodes introduced
for modeling purposes
Subcircuit Definition
The main circuit refers to the circuit definition which begins with the title statement,
which is the first line in the input file, and ends with the .END statement, which is the
last significant line in the input file. Any number of subcircuits can be defined within
the main circuit. The subcircuits can also be nested within other subcircuits. As many
as 20 levels of nesting are allowed. A typical group of statements defining a subcircuit
definition duplicates the following pattern of statements:
Start Subcircuit Statement
Comment Statements
Device Statements
Model Statements
Subcircuit Definitions
Control Statements
End Subcircuit Statement
Obviously, the "Start Subcircuit Statement" and the "End Subcircuit Statement" must
be the first and the last statements, respectively, in the definition of a subcircuit.
Between these start and end statements, the comment statements, device statements,
model statements, subcircuit definitions, and control statements can appear in any
order or sequence without any effect on the reading of the input file.
Parent and Child Relationships for Subcircuits
When a subcircuit named "AAA" is defined in a general circuit named "BBB", then the
subcircuit "AAA" is considered the child of the general circuit "BBB" and the general
circuit "BBB" is considered the parent of the subcircuit "AAA". Each subcircuit can
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