[SI-LIST] Re: Board via characteristics (fwd)
- From: "Raj Raghuram" <raghu@xxxxxxxxxxx>
- To: <Raymond.Anderson@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 12 May 2002 10:09:49 -0700
Dear Ray and others,
It is possible to solve a via using a 2D solver, though not the kind one
usually thinks of. The via, pads, and antipads can be assumed to be circular
in which case the variations with the angle 'phi' in cylindrical coordinates
can be neglected. It is then a 2D problem in cylindrical coordinates. There
are a few papers based on this approach. I would be happy to dig out
references if anybody is interested.
This approach works for the capacitances, but not for the inductances. The
inducatances are dependent on the return path and a simulation of a larger
part of the structure may be necessary.
Best Regards,
Raj Raghuram
Sigrity, Inc.
"Achieve what others can't"
raghu@xxxxxxxxxxx
http://www.sigrity.com
4675 Stevens Creek Blvd. , Ste 130
Santa Clara, CA-95051
PH: 408-260-9344 x116
CELL: 408-390-7614
FAX: 408-260-9342
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ray Anderson
> Sent: Thursday, May 09, 2002 2:32 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Board via characteristics (fwd)
>
>
>
>
> >Hi, Ray:
> >
> >I think most 2.5D simulators do not use equations for the vias. They do
> >simulate it. However, most of them assume the current is constant in the
> >z-direction. The IE3D from Zeland Software, Inc. does solve the current
> >variation in the z-direction. The IE3D even solves the current on an
> >arbitrary 3D polygons such as wire bonds precisely. Thanks!
> >
> >-----------------------------------------------------------------------
> >Jian-X. Zheng, Ph.D
>
> Jian-
>
> Thanks for the update. I must admit it has been a few
> years since I was evaluating field solvers. I'm glad
> to hear that trend is towards actually field solving the
> 3D discontinuities as opposed to solving pre-defined
> equations as was common a few years ago.
>
> However, be aware that there are still some out there
> that utilize the equation based approach. (vendor names
> withheld to protect the guilty :)
>
> -Ray
>
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