eldo_user

Running Parametric Analyses
.ALTER Examples
By default, Eldo substitutes the .STEP commands in the main netlist by those found in .ALTER
statements. To append .STEP commands in .ALTER statements, instead of substituting, use
option ALTER_ADDSTEP.
.PARAM statements present in a .ALTER section are systematically added at the end of the
netlist being created for the current ALTER run. Eldo will not attempt to replace the parameter
name; it is recommended to avoid using .ALTER to replace parameters inside .SUBCKT
statements.
By default, .ALTER restarts from the original netlist, in compat mode .ALTER is cumulative,
see “Commands in Compat Mode” on page 168.
See Also
• .ALTER in the Eldo Reference Manual
Related Topics
Altering Netlist Data For Simulation Reruns
.ALTER Examples
.ALTER Examples
Examples of rerunning simulations with a modified netlist using the .ALTER command.
This example specifies two simulation runs. Both perform an AC analysis but certain
component values, the number of points and stop frequency of the AC analysis are changed
using the .alter command for the second run.
alter command example
r1 1 2 1k
r2 2 0 1k
c1 2 0 1n
.ac dec 10 200 1000meg
vin 1 0 ac 1
.plot ac vdb(2) (-90, 0)
.alter
r1 1 2 10k
c1 2 0 100p
.ac dec 15 200 1500meg
.end
This example shows how to replace one included file with another one when using the Eldo rerun
facility with the option ALTINC. The new_models file will be included in the re-run
simulation instead of models.
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Eldo® User's Manual, 15.3