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

  • From: Rajan Hansa <all.si.list@xxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Wed, 18 May 2011 16:14:24 +0530

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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