[SI-LIST] Re: Maximum Frequency for S-parameter Extraction of Board Power Plane

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Wed, 18 May 2011 03:51:42 -0700

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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