[SI-LIST] Re: Netlist or W Elements for HSpice from Cadence Allegro
- From: Inmyoung Song <imsong91@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 3 Aug 2010 08:44:15 +0900
Hello Mani,
How about use spc2spc in cadence?
After that command we can get the main_gen.spc which is spice netlist.
You can edit or open the text editor and can't miss the .subckt syntax...
If you more information let me know, I show you an example...
2010/8/3 Chi Tu <Chi.Tu@xxxxxxxxxx>
> Hello Mani,
>
>
> To clarify, HSPICE does have the ability to use s-parameter models in
> simulation by using an S-element.
>
>
>
> 1)Here's an example of how to do this for a differential pair s-par
> model in Touchstone format:
>
>
>
> Sdiffpair inp inn outp outn GND mname=tracemodel
>
> .MODEL tracemodel S TSTONEFILE='../diffpair.s4p' INTDATTYP=RI
> INTERPOLATION=LINEAR FMAX@GIG FBASE=9.765625Meg
>
>
>
> The FMAX is the max frequency point in your touchstone model.
>
> The FBASE relates to the sampling frequency that you tell HSPICE to use
> for doing an IFFT to get time-domain data.
>
> There is a nifty S-parameter Appnote on Solvnet that covers this in more
> detail.
>
> https://solvnet.synopsys.com/retrieve/017600.html
>
> You can also refer to Chapter 2 of the "hspice_si.pdf manual to learn
> about the other s-element options.
>
>
>
> 2)Also, the W-element does have an option to reference an s-par model
> instead of an RLGC file.
>
>
>
> Wdiffpair inp inn gnd outp outn gnd smodel=tracemodel
>
> + N=2 L='10*.0254'
>
> + nodemap=i1i2o1o2
>
> .MODEL tracemodel S TSTONEFILE='../diffpair.s4p' XLINELENGTH='5*.0254'
>
>
>
> The advantage of calling an s-par model through a W-element is the
> ability to scale the length by changing the "L" value.
>
> To scale properly, be sure to set the "XLINELENGTH" to match the
> original s-par model length.
>
> The example above takes a 5-inch line and scales it to 10-inch.
>
>
> Regards,
>
> Chi Tu
> Design Engineer
> Plexus Technology Group
> 361 Centennial Pkwy
> Louisville, CO 80027
>
>
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Mani Ganesan
> > Sent: Tuesday, July 20, 2010 12:26 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Netlist or W Elements for HSpice from Cadence
> Allegro
> >
> > Hello
> > I have a board file and I would like to do a TDR analysis in HSpice.
> To
> > do
> > that I need to create a netlist for HSpice and I need W element (RLGC)
> > of
> > the trace. I cannot create that by hand. Can anyone tell me whether I
> > can
> > create the W element or Netlist of a specific differential trace under
> > interest from the board file in Cadence? Is there an option in the
> tool.
> >
> > I have a 3d modeling tool. But the touchstone gives only S matrix I
> > believe.
> > How can I get the W element of the trace so that I can use it in
> HSpice?
> >
> > Thank You
> > Mani Ganesan
>
>
>
>
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--
Signal Integrity Engineer
South Korea
http://www.signalintegrity.co.kr
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