I would like to use an arbitrary wave function as the input stimulus in my Spectre simulation (analog circuit). Usually when we run a Spectre simulation, we could use the
standard stimulus such as Vsin, Vpulse etc from the analogLib. What if I need an arbitrary wave function as the stimulus, for example, exponentially increased sine wave? I guess this can be done thru CDF. Is there an easier way? Or are there any 3rd party component lib available?  
thank you so much!
Eric
p.s.: Which cdsdoc manual should I look into to find out the syntax for the stimulus file? Any examples? Thanks againi!

[quote author=Ken Kundert  link=1111015375/0#1 date=1111035287]There are two ways of creating arbitrary waveforms. You can use the piecewise linear waveform capability of sources (Vpwl, ...), in which case you have to construct the waveform by hand or write a program to create it. Or you can use Verilog-A to create the waveform.

-Ken [/quote]

Could you provide any examples or a good reference on this? Thanks!