[SI-LIST] Re: HSPICE Field Solver

All,
I don't necessarily agree. Some HSPICE questions are useful to the SI
reflector. It lends insight to some of the issues and work arounds and
can save some of us time in the long run. I have also learnedhow to use
some additional features with the product that I may not have other wise
known by watching the reflector.  

Peter


-- 
Peter LaFlamme

Applied Micro Circuits Corp.
Staff System Applications Engineer
200 Minuteman Rd, 3rd Floor
Andover, MA 01810

978-247-8470 phone
978-623-0055 Fax


"ruston, matt" wrote:
> 
> Assuming his maintenance is paid up!!! :^)
> 
> -----Original Message-----
> From: Ted Mido [mailto:mido@xxxxxxxxxxxxxx]
> Sent: Tuesday, October 16, 2001 1:44 PM
> To: marekski@xxxxxxxxxxxxxxxxxx
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: HSPICE Field Solver
> 
> Hi Marek:
> 
> I think your signal conductors are overlapped on the upper reference
> plane...(Is it what you want?)
> 
> Please send this type of problem to Avant! technical support
> from next time you find problem(s) with Hspice.
> 
>         ted mido @ avant!
> 
> From: "Marek Skibinski" <marekski@xxxxxxxxxxxxxxxxxx>
> Subject: [SI-LIST] HSPICE Field Solver
> Date: Tue, 16 Oct 2001 15:54:00 +0100
> 
> > Guys,
> >
> > I am running HSPICE 2001.2 to do SI work on a Backplane. Unfortunately the
> > field solver within HSPICE is giving me suspect results. Here is the code
> > that I am using for my W element setup:
> >
> > ___________________________________________________
> > * Track shape definiton widths to suit
> >
> > .SHAPE rect RECTANGLE WIDTH=0.0001016m, HEIGHT=0.00001778m,
> >
> > * Preliminary layer stack
> >
> > .LAYERSTACK stack_1,
> > +LAYER=(PEC,0.00001778m), LAYER=(getek,0.000381m),
> > +LAYER=(PEC,0.00001778m)
> >
> > * Setting field solver options to high accuracy
> >
> > .FSOPTIONS opt1_1 GRIDFACTOR=3 PRINTDATA=YES
> > +ComputeRo=yes ComputeRs=yes ComputeGo=yes ComputeGd=yes
> >
> > *-----------------------------------------------------------------------
> > * Tx Card T-line
> > *
> >
> > .MODEL tx_card_line W MODELTYPE=FieldSolver,
> > +LAYERSTACK=stack_1, FSOPTIONS=opt1_1
> > +RLGCFILE=txcardli.rlgc
> > +CONDUCTOR=(MATERIAL=copper, SHAPE=rect, ORIGIN=(0m,0.00038989m)),
> > +CONDUCTOR=(MATERIAL=copper, SHAPE=rect, ORIGIN=(0.0002289m,0.00038989m))
> >
> > ________________________________________________________
> >
> >
> > And here is the resulting rlgc file:
> >
> > _________________________________________________________
> > *SYSTEM_NAME : tx_card_line
> > *
> > *  ------------------------------------ Z = 4.1656e-07
> > *  //// Top Ground Plane //////////////
> > *  ------------------------------------ Z = 3.9878e-07
> > *       getek   H = 3.81e-07
> > *  ------------------------------------ Z = 1.778e-08
> > *  //// Bottom Ground Plane ///////////
> > *  ------------------------------------ Z = 0
> >
> > * L(H/m), C(F/m), Ro(Ohm/m), Go(S/m), Rs(Ohm/(m*sqrt(Hz)), Gd(S/(m*Hz))
> >
> > .MODEL tx_card_line W MODELTYPE=RLGC, N=2
> > + Lo =  2.82310e-08
> > +       0.00000e+00  2.82310e-08
> > + Co =  1.53499e-09
> > +       0.00000e+00  1.53499e-09
> > + Ro =  9.61063e+06
> > +       0.00000e+00  9.61063e+06
> > + Go =  0.00000e+00
> > +       0.00000e+00  0.00000e+00
> > + Rs =  1.05871e+00
> > +      -2.46652e-03  1.05871e+00
> > + Gd =  9.64460e-11
> > +       0.00000e+00  9.64460e-11
> >
> > ______________________________________________________
> >
> >
> > The results from the SigXplorer field solver indicate different values by
> a
> > factor of 10 in both capacitance and inductance of the track.
> >
> > Could you have a look at the code and tell me if there is a problem with
> > the field solver or am i just missing something a bit more fundamental.
> >
> > Thanks for your help,
> >
> > Marek
> >
> > **********************************************************
> > Marek Skibinski
> > Hardware Design Engineer
> > Nortel Networks
> > Doagh Road, Newtownabbey, Co. Antrim
> > BT36 6XA
> > Tel: +44 (0)2890363494 (ESN 751-3494)
> > **********************************************************
> >
> >
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