In the past, it was possible to import x-y data by using
picewise linear voltage or current sources.
Unfortunately, the length of such a data set was limited
to 1000 .. 5000 points depending on the speed of the
employed computer.
Now , the SPICE3 kernel has been extended.
It is possible to import
x-y data by telling SPICE3 where to read the data .
The syntax is as follows:
V0 1 0 DC 1 AC 1 filepwl filename= <filename>
Such a netlist entry is generated after filling in the
'filename' entry of a piecewise linear voltage source.
When using HSPICE as simulator engine, the contents of the
file containing the x-y data is written into the netlist instead.