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.alter command is very useful for hspice simulation, it can replace the temp, power_val, model corner and other parameters define, below is a sample of simulation netlist:
.alter is Used to re-run simulation with a modified netlist. All simulation statements between the .ALTER command line and either the next .ALTER or .END command are back-substituted in the original netlist
Examples
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
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.
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