From: Degerstrom, Michael J. ([email protected])
Date: Tue Apr 10 2001 - 12:37:26 PDT
You could also simply generate a pwl voltage source with
your selected PRBS pattern. It takes a little programming
to do this efficiently but I think it will run faster than
having to build a LSFR circuit and run it in your simulation.
Mike Degerstrom Email: [email protected]
Mayo Clinic; 200 1st Street SW ; Rochester, MN 55905
Phone: (507) 538-5462 FAX: (507) 284-9171
> -----Original Message-----
> From: Ray Anderson [mailto:[email protected]]
> Sent: Tuesday, April 10, 2001 1:17 PM
> To: [email protected]
> Subject: Re: [SI-LIST] : SPICE eye diagram
> Yes, certainly is possible. Depending on the variety of spice you
> are using it can range from very easy to requiring just a little work.
> Using Hspice or Pspice you need to define a prbs generator by
> building an appropriate LFSR (linear feedback shift register) with
> the correct feedback taps connected for the PRBS length you want
> to use. Utilize the output of your PRBS generator to drive your
> circuit. Then you need to set up your viewing tool (Probe for pspice,
> Awaves for hspice) properly to display an eye diagram.
> (Repetive traces
> need to be superimposed over each other). If you are using
> Apsim Spice,
> generating eye-diagrams is almost automatic. There is a way
> to automatically
> generate PRBS patterns and the viewing facility has a button
> that automatically
> configures things properly for eye-diagram generation.
> >I would like to display eye diagrams in SPICE simulators which
> >means generating a suitable input data pattern. Is it possible
> >in SPICE generate PRBS or PRBS-like patterns?
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