FPGA Central

#1 (**permalink**) 03-20-2009, 02:53 PM

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Dear All,

=20

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

=20

I have a plane pair as show below

=20

=20

=20

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

=20

=20

=20

=20

=20

I have the following doubts

=20

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?

=20

=20

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

=20

=20

Thanks in advance

=20

Regards,

Lakshminarayanan=2ES

=20

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distribution and / or publication of=20
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Dear All,<o

></o

>

<o

> </o

>

          &n=
bsp; 
I have attached the stack-up with which I have done my PI analysis for 1=
=2E0V
1=2E315Amps in cadence PI tool<o

></o

>

<o

> </o

>

I have a plane pair as show=
below<o

></o

>

<o

> </o

>

<img width=3D253 height=
=3D121
id=3D"_x0000_i1027" src=3D"cid:image001=2Egif@01C9A988=
=2EC0628BE0"><o

></o

>

<o

> </o

>

When I take VCC and bottom ground plane alone for the PI
analysis with 470uF bulk it is only solving up to=
6MHz<o

></o

>

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<o

></o

>

<o

> </o

>

<o

> </o

>

<o

> </o

>

<img width=3D423 height=3D290 id=3D"_x0000_i1025"
src=3D"cid:image004=2Ejpg@01C9A988=
=2EC0628BE0"><o

></o

>

<o

> </o

>

I have the following=
 doubts<o

></o

>

<o

> </o

>

<![if !supportLists]>1)      =
<![endif]>What I have
assumed as plane pair is correct or not<o

></o

>

<![if !supportLists]>2)      =
<![endif]>How this is possible…=
=2E?<o

></o

>

<![if !supportLists]>3)      =
<![endif]>Is it a bug
in the tool?<o

></o

>

<![if !supportLists]>4)      =
<![endif]>Or it is
actually correct, then how …can any one give the theory behind this=
if it
is true?<o

></o

>

<![if !supportLists]>5)      =
<![endif]>Is this kind
of stack up will work for the high speed=
board?<o

></o

>

<o

> </o

>

<o

> </o

>

Please clarify my=
doubts…=2E!!<o

></o

>

<o

> </o

>

<o

> </o

>

Thanks in=
advance<o

></o

>

<o

> </o

>

Regards,<o

></o

>

Lakshminarayanan=
=2ES<o

></o

>

<o

> </o

>

</div>

</body>

</html>

<table><tr><td bgcolor=3D#ffffff>DISCLAIMER: 
---------------------------------------------------------------------------=
-------------------------------------------- 
 
The contents of this e-mail and any attachment(s) are confidential and=
intended for the named recipient(s) only=2E 
It shall not attach any liability on the originator or HCL or its=
affiliates=2E Any views or opinions presented in 
this email are solely those of the author and may not necessarily reflect=
the opinions of HCL or its affiliates=2E 
Any form of reproduction, dissemination, copying, disclosure, modification,=
distribution and / or publication of 
this message without the prior written consent of the author of this e-mail=
is strictly prohibited=2E If you have 
received this email in error please delete it and notify the sender=
immediately=2E Before opening any mail and 
attachments please check them for viruses and defect=2E 
 
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