[SI-LIST] Re: The precision of Ansoft Maxwell 2D
- From: zhangkun 29902 <zhang_kun@xxxxxxxxxx>
- To: Scott McMorrow <scott@xxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 23 Jul 2004 07:39:15 +0800
Scott
I agree with you that it is very difficult to measure this kind of structure.
In our measurement, I have changed the method several times. Do you know if
there is some document describe this kind of method?
In order to avoid common mode noise because of balance and unbalance
connection, I have used transformer.
Best Regards
Zhangkun
2004.7.23
----- Original Message -----
From: Scott McMorrow <scott@xxxxxxxxxxxxx>
Date: Friday, July 23, 2004 0:17 am
Subject: Re: [SI-LIST] Re: The precision of Ansoft Maxwell 2D
>
> zhangkun 29902 wrote:
>
> >Scott
> >
> >I use Ansoft Maxwell 2D to simulate the crosstalk between
> differential pairs without ground plane. The EM field should be of
> TEM mode.
> >
> >
> >
> Zhangkun,
>
> There are several possibilities.
>
> First, it is very difficult to measure this sort of structure.
> Additional modes are very easy to excite, so be sure that you are
> not
> exciting additional modes. In HFSS, you may have the same problem
> if
> the ports for the differential pairs are close together. If you
> have
> not done so already, your test structure should have the ability
> to
> separate the differential pairs at the port, so that there is no
> coupling.
>
> Second, you may need to use a much lower error energy in Maxwell
> 2D in
> order to force a higher mesh density. This will give you a much
> more
> accurate result. If you are interested in crosstalk at one
> particular
> frequency, then I would suggest using the impedance and admittance
> matrices to create a w-element model, as it will include the
> effect of
> finite field penetration at high frequencies within the conductors.
>
> Third, the computation boundary in Maxwell 2D can also cause
> significant
> errors if the structure you are extracting is placed too close to
> the
> outside bounding box. Keep enlarging you box, until your matrices
> do
> not change significantly, or produce a plot of the electric and
> magnetic
> fields lines to determine if the boundary is interferring with
> your
> solution.
>
> regards,
>
> scott
>
> Scott McMorrow
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
> (401) 284-1827 Business
> (401) 284-1840 Fax
> (503) 750-6481 Cellular
> http://www.teraspeed.com
>
> Teraspeed is the registered service mark of
> Teraspeed Consulting Group LLC
>
>
>
>
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