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Chapter 5 Parts
Property
name
Property value
Purpose
Model
X
Ensures netlist line starts with X.
Identifies part as a subcircuit.
Should be hidden and protected
Value
subcircuit_name
Name used to reference
subcircuit definition. Can be
changed by user after placing on
schematic.
Ref
component_reference E.g. U?. Automatically allocated
when placing symbol on
schematic.
Most symbols possess these properties anyway, the important fact is that the model
property must be set to X. When defining a symbol from scratch, these properties can
be defined in one go in the graphical symbol editor with
Property/Pin|Add Standard Properties... .
To use the sub-circuit definition, SIMetrix must be able to find it. There are various
places where it can be put and means of telling SIMetrix of the location. These are the
choices.
1.
Place the definition directly in the simulator command - or F11 - window (see
“Manual Entry of Simulator Commands” on page 59). If placed at that location,
it will be read in unconditionally and SIMetrix will not need to search for it.
2.
Put in a separate file and pull in to the schematic with .INC control (see
Simulator Reference Manual) placed in simulator command (F11) window. As 1.,
this will be read in unconditionally.
3.
Put in a library file and reference in schematic with .LIB control (see Simulator
Reference Manual) placed in simulator command (F11) window. Similar to 2. but
more efficient if library has many models not used in the schematic. Only the
devices required will be read in.
4.
Put in a library file and install it using the procedure described in “Full Model
Installation Procedure” on page 167. This will make the device globally available
to all schematics. You can also install it into the model library browser system.
These topics are covered in “Device Library and Parts Management” on
page 166 and are also the subject of Tutorial 3.
To place the device on the schematic, find the symbol in schematic popup
All Symbols... and place in the normal way. After it is placed, select the device and
press shift-F7 and enter the subcircuit's name.
If you installed the device into the model library browser system, as mentioned in
choice 4 above, you will be able to place the device by pressing control-G and
selecting the device from the appropriate category. The model library browser system
also provides a simple to use means of overcoming the problem mentioned above that
occurs if the symbol's pin order does not match the subcircuit's node order. This is
explained “Associating Multiple Models with Symbols” on page 174.
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