[SI-LIST] Re: 2D, 2.5D,3D

From: Robert Kezer <Robert.Kezer@xxxxxxxxxxxxx>
To: "'deibele@xxxxxxx'" <deibele@xxxxxxx>, si-list@xxxxxxxxxxxxx
Date: Mon, 2 Dec 2002 10:29:50 -0500
I would like to be more explicit, sense this can be confusing.

I have never used a 2.5D field solver. I have only used 2D and 3D. Not sure
why anyone would use a 2.5D field solver.

A 2.5D extractor uses data generated from a 3D field solver in the form of
either pattern matching or extrapolation.

I was referring to the 2.5D extrator in prior email, I should have been
explicit
with this.

Bob

-----Original Message-----
From: C Deibele [mailto:deibele@xxxxxxx]
Sent: Monday, December 02, 2002 10:13 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 2D, 2.5D,3D



2-d implies that only the x-y coordinates matter (or all d/dz=d^2/dz^2=0)
an example of a 2-d problem is finding the capacitance of an infinitely
long piece of coax.

2.5d implies that all three coordinates matter, but variation in z
is severely restricted.  examples of this are calculating crosstalk
on neighboring traces, or the classic bethe theory for calculating
coupling between two waveguides with infinitely thin walls.
a common technique for 2.5-d is moment method.

3d is just what you think it is.  full three dimensional.
common solving techniques are finite difference time domain, or
finite element.

these are usually referred to when solving a problem _numerically_.

regards,

craig deibele

Robert Kezer wrote:
> The only place I have used 2.5D extractors is when I am extracting
> parasitic information for placed and routed ASICs. Generally this is
> only distribute RC parasitics. These parasitics are then back annotated
> into the verilog and static timing analysis is performed.
> 
> The advent of 2.5D was to address the need for accurate parasitic
extraction
> for very large ASICs, but not take for ever as a 3D solver would.
> 
> Bob
> 
> -----Original Message-----
> From: Zhou, Xingling (Mick) [mailto:xlzhou@xxxxxxxxx]
> Sent: Monday, December 02, 2002 9:44 AM
> To: edpc108@xxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: 2D, 2.5D,3D
> 
> 
> 
> 
> There was a discussion about 2.5D the end of last year.  Unfortunately,
> seems there is no clear agreement on 2.5D, especially on how it is related
> to an advanced word "fractional theory". There is a paper provided by
Shawn.
> But do not confuse yourself while reading the paper. You can search it in
> the archive. 
> 
> Good luck.
> 
> Mick
> 
> 
> -----Original Message-----
> From: edpc108 [mailto:edpc108@xxxxxxxxx]
> Sent: Monday, December 02, 2002 9:12 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] 2D, 2.5D,3D
> 
> 
> 
> what exactly the terms 2D, 2.5D, 3D in the field solvers refer to ?
> 
> Thanks in advance,
> Jayaprakash
> 
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[SI-LIST] Re: 2D, 2.5D,3D

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