[SI-LIST] Re: Transient sim in specific time points

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: Ben <ben01010@xxxxxxxxx>
  • Date: Fri, 26 Mar 2010 02:34:42 -0700

I think the closest you can get is to specify a minimum time step equal 
to or an integer fraction of the common sample interval you want.  You 
might still  be getting interpolated data, but the interpolation offset 
s/b close to uniform for each point.

So if for example you want to get as close as possible to 1ns 3ns 5ns 
and 14ns, the common minimum step interval would be 1ns or an integer 
fraction of 1ns.

Ben wrote:
> Hi all
> I need to perform a transient simulation but i need the results at specific
> time instants.
> I know that, regardless of the internal time steps Hspice internally may
> take for numerical integration user can get the simulation results at
> specific time instants (eg. equally spaced time points) defined by .tran
> command.
> In my case I have a list of time points (say 1000 points) at which I need
> the transient response. These time points are not equally separated.
> According to Hspice-command-ref I guess the following statement may have a
> clue for the solution
> .TRAN data = dataname
> This example is a data-driven time sweep. It uses a data file
> as the sweep input. If the parameters in the data statement
> are controlling sources, then a piecewise linear specification
> must reference them.
> But I am not sure whether it can give me what i am looking for or how I can
> define "data-file" indicated as  data = dataname.
> What is the required file structure for the data-file,
> I would appreciate any input in this regard.

Steve Weir
150 N. Center St. #211
Reno, NV  89501 

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