[SI-LIST] Re: non-negative off diagonal capacitive matrix elements ??
- From: "Zhou, Xingling (Xingling)" <xlzhou@xxxxxxxxx>
- To: "'Raymond.Anderson@xxxxxxx'" <Raymond.Anderson@xxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Fri, 31 Aug 2001 13:18:13 -0400
Hi,Ray
Theoretically, all off-diagonal elements must be non-positive. As we expect
the coupling decreases rapidly. If you really want to calculate the last
coupling, I suggest you increase the accuarcy. I doult it is a numerical
decrepency. Obiously,
compared to others, the positive one is very small.
Mick
-----Original Message-----
From: Ray Anderson [mailto:Raymond.Anderson@xxxxxxx]
Sent: Friday, August 31, 2001 1:08 PM
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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