[SI-LIST] Re: Maximum Frequency for S-parameter Extraction of Board Power Plane
- From: Rajan Hansa <all.si.list@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Wed, 18 May 2011 16:42:58 +0530
Thanks Steve for being always prompt in reply !!
Can you please explain how you have got this magical figure, 3 X highest
package cut-off frequency ? Why It's not 2 X or 1 X ??
Rajan
On Wed, May 18, 2011 at 4:21 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> If you are concerned only with power delivery then simulate to 3X the
> highest package cut-off frequency of any device you are concerned with
> that is attached to a given power rail.
>
> Steve.
> On 5/18/2011 3:44 AM, Rajan Hansa wrote:
> > Hello All,
> >
> >
> > I have got a PCB database of one Ethernet Board and I have to extract
> > s-parameter for all power plane from voltage regulator to power pin of
> > chip package. The Board database includes all decap.
> >
> >
> >
> > As we know extraction time is directly related with maximum frequency So
> > while setting maximum frequency for s-parameter extraction, I am bit
> > confused, I would like to know that do I need to set knee frequency (
> Fknee
> > = 0.35/Trise) as maximum frequency OR for board level simulation we
> > shouldn?t care knee frequency.
> >
> >
> >
> > As per my understanding, package inductance won?t allow very high
> frequency
> > component (switching current component which depends on Trise !!) to
> travel
> > to board from chip so voltage regulator in board will never see those
> high
> > switching current so I shouldn't simulate/extract s-parameter till knee
> > frequency.
> >
> >
> >
> > What?s expert view on this ?
> >
> >
> >
> > Rgds,
> >
> > Rajan
> >
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>
> --
> Steve Weir
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