[SI-LIST] Re: IIP3 analysis with netlists having nport statements
- From: Amitava Bhaduri <bhadhua@xxxxxxxxxxxx>
- To: Yu Zhu <yzhu@xxxxxxxxxxx>
- Date: Mon, 9 Feb 2004 15:01:23 -0500 (EST)
Hi Yu,
I have spectre version (ver. 4.4.6.061203 -- 12 Jun 2003) and I have made
the change that you have advised me to do. But I am still having some
problems. I cannot add interp=rational after the model statement. In that
case it gives an error like:
`sp_data1': `interp' is not a valid parameter for `nport' models
However, I can add interp=rational after the instance statement like:
X1 (a1 a2 b1 b2 ) sp_data1 interp=rational
In this case, the earlier error does not occur though spectre encounters a
segmentation fault after starting the rational fitting process. The error
that I get is:
--------------------------------------------------------
Starting rational fitting process.
Internal error found in spectre during initial setup. Please run
`getSpectreFiles' or send the netlist, the spectre log file, the
behavioral model files, and any other information that can help
identify the problem to support@xxxxxxxxxxxx
Segmentation fault.
Abort
----------------------------------------------------------
Could you please let me know what's happening in this case and possible
solution.
Thanks,
Amitava
On Mon, 9 Feb 2004, Yu Zhu wrote:
> Amitava,
>
> Add "interp=rational" after " model sp_data1 nport
> file="spNport1.data" ", so that it will ask Spectre to build a rational
> model (equivalent circuit) for the nport.
>
> There are basically two methods for nport: rational fitting
> (interp=rational) and convolutionary methods (interp=linear or
> interp=spline). Both methods work for transient analysis. But so far
> the convolunary methods don't work for RF analyses. So you have ask
> Spectre to use rational fitting.
>
> The good news is the RF analyses will begin to support convolunary
> methods after 5.0.41. In 5.0.41, the driven PSS will be supported for
> nport using convolunary methods. In 5.0.41, the autonomous PSS will
> follow ...
>
> Yu
>
> > -----Original Message-----
> > From: Amitava Bhaduri [mailto:bhadhua@xxxxxxxxxxxx]
> > Sent: Friday, February 06, 2004 1:59 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] IIP3 analysis with netlists having nport statements
>
> >
> >
> >
> >
> > Hi,
> >
> > I am facing a problem when doing Cadence Spectre simulation for IIP3
> > analysis on a netlist that has "nport" statements modeling the
> > interconnects of a circuit. As an example I am giving the nport
> > statement of a 2 port network that I have in my netlist below:
> >
> > --------------------------------------------
> > simulator lang=spectre
> > model sp_data1 nport file="spNport1.data"
> > //Components
> > X1 (a1 a2 b1 b2 ) sp_data1
> > -------------------------------------------
> >
> > The file "spNport1.data" contains the s-parameters (2x2
> > matrix) of the interconnects (a1 to a2 and b1 to b2) as a 2-port
> > network. The netlist has other elements like resistors, transistors,
> > inductors and capacitors connected to each other to form an LNA
> > topology. There are other "nport" statements too for other
> > connectivities but I have given an instace with 2 nets connecting a
> > few of the components.
> >
> > When I simulate the entire netlist for doing the IIP3 analysis I get
> > an error like this:
> >
> > **********************************************************
> > Error found by spectre during periodic steady state analysis `pss1'.
> > Distributed components and components with hidden state are not
> > allowed
> > with this analysis -- analysis skipped.
> > nport
> >
> > Analysis `pss1' terminated prematurely due to error.
> > *********************************************************
> > As pss and pac analysis are essential to do the IIP3 analysis, I am
> > not sure how to avoid this error from happening and to determine IIP3
> > of a netlist that has "nport" statements describing the interconnects.
>
> >
> > Can anyone of you help me on this.
> >
> > Thanks and Regards,
> > Amitava
> >
> > Amitava Bhaduri
> > Research Assistant
> > 527 ERC
> > University of Cincinnati
> > OH - 45220
> > ph(lab) : 513-556-3025
> >
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> >
>
Amitava Bhaduri
Research Assistant
527 ERC
University of Cincinnati
OH - 45220
ph(lab) : 513-556-3025
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