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

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
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>
>

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: