[SI-LIST] Re: Off diagonal Gij in RLGC matrix
- From: "Sogo Hsu" <sogo.hsu@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Apr 2004 03:21:09 -0000
Shulong,
You can treat Rij as a transfer impedance between port i and j. In
other words, it is the ratio of induced voltage at port i caused by
the source current at port i. Hope it is helpful.
Sogo Hsu, Ph. D.
Foxconn
--- In si-list@xxxxxxxxxxxxxxx, slwu <Shulong.Wu@xxxx> wrote:
> Hi Ji,
>
> Then how to understand Rij which confuse me for a long time ??
>
> Thanks in advance
>
> Shulong
>
> Ji Zheng wrote:
>
> > Chris,
> >
> > Actually Gij is easier to understand compared to Rij.:-) Gij is
the negative
> > of the conductance between line i and line j (in the cross
section) while
> > Gii is the total conductance between line i and ground as well as
other
> > lines. Think of Cij and Cii, they are analogous to Gij and
Gii......
> >
> > Ji
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxx
> > [mailto:si-list-bounce@xxxx]On Behalf Of Chris Cheng
> > Sent: Tuesday, April 13, 2004 5:06 PM
> > To: si-list@xxxx
> > Subject: [SI-LIST] Off diagonal Gij in RLGC matrix
> >
> > Dear friends,
> > I am loosing faith in the HSPICE fieldsolver W element on
transmission line
> > at long distant and very high speed. One alternative I am looking
into is to
> > use frequency dependent tabular W models especially coupled with
TDR or SNA
> > measurements I can do in the lab. While The R,L,C part of the
matrix is
> > relatively easy to understand and model, I am having a hard time
visualizing
> > the off diagonal elements in the G matrix. Conventional thinking
suggest the
> > diagonal Gii elements can be used to model dielectric loss, I
haven't seen
> > any reference to what is the meaning of the Gij's and how to
determine it
> > experimentally.
> > So the question is :
> > a) Is it even worth generating Gij numbers or simply ignore it ?
> > b) If Gij are needed, how to determine them experimentally ?
> > ------------------------------------------------------------------
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