As this is optional in Ngspice, and indeed in other SPICE derived circuit simulators, it is not implemented in. This can occur in an X subcircuit call to One code word often found in the SPICE extended subcircuit syntax is the term PARAMS. This works well, but does have one disadvantage however, in that some published subcircuit netlists may require a small amount of editing before they will simulate with. Implements a common subset of the published extended SPICE subcircuit syntax. One consequence of this is that over time divergence of the SPICE subcircuit statement syntax has occurred amongst different circuit simulators. Recent generations of open-source GPL circuit simulators, including Ngspice, Xyce and SPICE OPUS, have been extended by their Development Teams to allow subcircuits with parameters. Unfortunately, SPICE 3f5 only implements subcircuits without parameters. Require component values or device parameter values of differing value. This form of subcircuit can, for example, be used to represent manufacturers product variations which have identical circuits but Subcircuits which have component or physical parameter values set by a list of names and values attached to a schematic symbol add a significant “value added”įeature to the subcircuit concept. Default Ngspice build is shipped without it.
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