[SI-LIST] Re: Copper width that has DCR within target spec
- From: Cristian Gozzi <cristian.gozzi@xxxxxxxxx>
- To: wufengthu@xxxxxxxxx
- Date: Mon, 30 Sep 2013 08:10:19 +0200
Hi folks
Just to remark that nowdays the full wave tools I well know (SIwave and
PowerSI) are capable to extract S - parameters and ancor DC point to their
embedded DC solver...
(DC Resistance FEM solver)
So no dc extrapolation any more, but an accurate model from DC up to the
highest frequency for an accurate PDN analysis.
Regards
Cristian
Chip - Package - Board
Staff Engineer
Infineon Technologies AG
Il giorno 30/set/2013 07:15, "Feng Wu" <wufengthu@xxxxxxxxx> ha scritto:
> Hi Novak
> I agree. I also mentioned it in the previous mail.
> There is not such a formular in hand. We need to use the dedicated DC
> solver.
> Thanks
> --
> B.R.
> Feng Wu (å´æ«)
> -------------
> Signal Integrity Engineer
> Cisco Shanghai
> -------------
>
>
> 2013/9/30 Istvan Novak <istvan.novak@xxxxxxxxxxx>
>
> > Hi Feng,
> >
> > What you say is all true, but unfortunately getting a reasonable estimate
> > for DC resistance by hand calculations under realistic (complex)
> geometries
> > is not possible. Even at DC the current density has a two (or three, in
> > multi-layer plane structures) dimensional distribution, so you need a
> tool
> > to mesh the structure and calculate the DC resistance.
> >
> > Regards,
> >
> > Istvan NovakOracle
> >
> >
> > On 9/28/2013 2:08 AM, Feng Wu wrote:
> >
> >> Hi Mark
> >> It is definitely true, we need to consider impedance from AC point of
> >> view.
> >> However I would like to check/design the DC performance at beginning
> >> before
> >> checking/designing AC performance. In practice this is proved to be more
> >> effiecient way. There are lots of reason. One of the most important is,
> >> although the DC point of Z is R, yet we can't obtain all the DC
> >> information
> >> accurately, sufficiently and efficiently by AC simulation tool.
> >>
> >> Thanks
> >> Feng
> >>
> >>
> >>
> >
>
>
> --
>
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