[SI-LIST] Re: [SI-LIST]: Which tool is the best - LINPARdiscussion
- From: Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>
- To:
- Date: Wed, 21 Apr 2004 13:01:45 -0700
Raj,
Please see my comments.
>1. If you are doing cables (say shielded twisted pair), it may be better
>to use a Finite Difference or Finite Element based more general 2-D
>software.
I am not sure why FDM or FEM inheritedly is better than MoM even in closed
boundaries. Can you explain ?
>2. I do not think it handles dielectric loss.
As mentioned in some response, it does model dielectric loss in 2.0
>3. It does not handle magnetic materials and probably neither do most
>commercial programs.
I will be very worry if my PCB starts to have magnetic material behavior
>4. If accurate skin effect inductance and resistance are important,
>again, other programs which divide the area of cross-section into many
>fine filaments would be needed.
To a degree. Linpar does generate the R(sqrt(f)) skin effect model based on
a fully pronounced skin depth assumption. One can argue whether this is good
enough for thick traces at >GHz
>5. It does not produce a HSPICE w-element compatible model directly.
But you can now use the touchstone S params models in HSPICE.
>6. I have already pointed out a minor problem I had with non-zero
>forward crosstalk for a homogenous medium
I will be very interested in the exact structure that generates this error.
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