[SI-LIST] Re: non-negative off diagonal capacitive matrix elements ??
- From: "Raj Raghuram" <raghu@xxxxxxxxxxx>
- To: <Raymond.Anderson@xxxxxxx>
- Date: Fri, 31 Aug 2001 12:57:19 -0700
I assumed Fred (of Apsim) was going to pitch in. So I held back for a while.
Anyway, Ray, as others have pointed out it is due to the off-diagonal
element being many orders of magnitude smaller than the diagonal element.
All off-diagonal elements should be negative. This one was positive due to
numerical error.
There are a number of options to increase the accuracy of ApsimRLGC
depending on the structure. Fred may be able to comment on that.
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: 408-390-9614
FAX: 408-260-9342
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ray Anderson
> Sent: Friday, August 31, 2001 10:08 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] non-negative off diagonal capacitive matrix elements
> ??
>
>
>
>
> 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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