[SI-LIST] FW: PI Analysis doubts (please help) - Plane pair problem
- From: "Lakshmi Narayanan Sowrirajan, TLS-Chennai" <lakshminarayanans@xxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 20 Mar 2009 18:23:20 +0530
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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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<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'>Dear All,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'> &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:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'>I have a plane pair as show=
below<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-indent:=2E5in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=2E0pt;font-family:Arial'><img width=3D253 height=
=3D121
id=3D"_x0000_i1027" src=3D"cid:image001=2Egif@01C9A988=
=2EC0628BE0"><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'>When I take VCC and bottom ground plane alone for the PI
analysis with 470uF bulk it is only solving up to=
6MHz<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'>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:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><img width=3D423 height=3D290 id=3D"_x0000_i1025"
src=3D"cid:image004=2Ejpg@01C9A988=
=2EC0628BE0"><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><b><u><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial;font-weight:bold'>I have the following=
doubts<o:p></o:p></span></font></u></b></p>
<p class=3DMsoNormal><b><u><font size=3D2 face=3DArial><span style=
=3D'font-size:10=2E0pt;
font-family:Arial;font-weight:bold'><o:p><span style=
=3D'text-decoration:none'> </span></o:p></span></font></u></b></p>
<p class=3DMsoNormal style=3D'margin-left:=2E5in;text-indent:-=
=2E25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'><span
style=3D'mso-list:Ignore'>1)<font size=3D1 face=3D"Times New Roman"><span
style=3D'font:7=2E0pt "Times New=
Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'>What I have
assumed as plane pair is correct or not<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E5in;text-indent:-=
=2E25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'><span
style=3D'mso-list:Ignore'>2)<font size=3D1 face=3D"Times New Roman"><span
style=3D'font:7=2E0pt "Times New=
Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'>How this is possible…=
=2E?<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E5in;text-indent:-=
=2E25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'><span
style=3D'mso-list:Ignore'>3)<font size=3D1 face=3D"Times New Roman"><span
style=3D'font:7=2E0pt "Times New=
Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'>Is it a bug
in the tool?<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E5in;text-indent:-=
=2E25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'><span
style=3D'mso-list:Ignore'>4)<font size=3D1 face=3D"Times New Roman"><span
style=3D'font:7=2E0pt "Times New=
Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'>Or it is
actually correct, then how …can any one give the theory behind this=
if it
is true?<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E5in;text-indent:-=
=2E25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'><span
style=3D'mso-list:Ignore'>5)<font size=3D1 face=3D"Times New Roman"><span
style=3D'font:7=2E0pt "Times New=
Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3DArial><span style=3D'font-size:10=
=2E0pt;font-family:Arial'>Is this kind
of stack up will work for the high speed=
board?<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=2E0pt;font-family:Arial'>Please clarify my=
doubts…=2E!!<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=2E0pt;font-family:Arial'>Thanks in=
advance<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'>Regards,<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=2E0pt;font-family:Arial'>Lakshminarayanan=
=2ES<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:=2E25in'><font size=3D2 face=
=3DArial><span
style=3D'font-size:10=
=2E0pt;font-family:Arial'><o:p> </o:p></span></font></p>
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the opinions of HCL or its affiliates=2E<br>
Any form of reproduction, dissemination, copying, disclosure, modification,=
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- » [SI-LIST] FW: PI Analysis doubts (please help) - Plane pair problem - Lakshmi Narayanan Sowrirajan, TLS-Chennai