[SI-LIST] Re: non-negative off diagonal capacitive matrix elements ??

Before we all get too hung up on this
the values are verry small - this
could be an issue of numerical noise
in the tool.

I suggest you rescale the model to say
10x your existing size and re-run the problem. Just check the tool operation
first..

Chas

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of fname lname
Sent: Saturday, September 08, 2001 2:40 PM
To: si-list@xxxxxxxxxxxxx; Raymond.Anderson@xxxxxxx
Subject: [SI-LIST] non-negative off diagonal capacitive matrix elements
??



 Hi Folks,
I have a question. Should the coupling coefficients in the maxwell
capacitence matrix always be in the descending order going down along a
column or can the coupling between the 2nd and 3rd element be greater than
between the 1st and 2nd element.
Any help is greatly appreciated.

Thanks,
Signal Guy.
--
>I've just extracted the RLGC matrices for 5 coupled
>striplines using Apsimtech RLGC.
>
>As expected, the diagonal elements of the capacitive matrix are
>positive capacitance values. All the off-diagonal elements are
>negative EXCEPT one. Is this correct. It has been a while since I've
>thought about this, but I was under the impression the capacitive
>off diag element were all negative. Anyone know for sure ??
>
>The element in column 1 row 5 is the one I question:
>
>
>   3.1600e-15
>  -4.9360e-16   3.2540e-15
>  -2.0080e-17  -4.8990e-16   3.2540e-15
>  -1.3380e-18  -1.9820e-17  -4.8990e-16   3.2540e-15
>   3.1280e-20  -1.3380e-18  -2.0080e-17  -4.9360e-16   3.1600e-15
>
>
>
>
>-Ray
>
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