[SI-LIST] PI Analysis doubts (please help) - Plane pair problem

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Dear All,

            I have attached the stack-up with which I have done my PI
analysis for 1=2E0V 1=2E315Amps in cadence PI tool

I have a plane pair as show below



When I take VCC and bottom ground plane alone for the PI analysis with
470uF bulk it is only solving up to 6MHz
But when I include the Top GND and the 1=2E0V plane as another plane pair
and does a multi plane analysis, with one 470uF see the results below=2E





 <<PI Analysis=2Edoc>>=20

I have the following  doubts

1)      What I have assumed as plane pair is correct or not
2)      How this is possible=2E=2E=2E=2E?
3)      Is it a bug in the tool?
4)      Or it is actually correct, then how =2E=2E=2Ecan any one give the
theory behind this if it is true?
5)      Is this kind of stack up will work for the high speed board?


        Please clarify my doubts=2E=2E=2E=2E!!


        Thanks in advance

        Regards,
        Lakshminarayanan=2ES



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