[SI-LIST] Re: J.L. Prince (Influcence of a floating plane......) Arizonauniversity
- From: "Jean Audet" <jaudet@xxxxxxxxxx>
- To: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- Date: Fri, 16 May 2003 15:00:28 -0400
Jeff, into the paper , they specified that eddy current created in the
floating plane influence the coupling between signal and ground (making the
partial mutual inductance lower and consequently the Leff worse)
I made quick quasistatic simulation and I got better Leff. I'll take a
deeper look
Jean Audet
Electrical Analysis
World Wide Packaging & Test
IBM Burlington
Tel: 802-769-0835, tie line: 446-0835
Tel: 450-534-6317, tie line: 552-6317
E-mail: jaudet@xxxxxxxxxx
"Loyer, Jeff"
<jeff.loyer@intel To: Jean
Audet/Bromont/IBM@IBMCA, <si-list@xxxxxxxxxxxxx>
.com> cc:
Subject: RE: [SI-LIST] J.L.
Prince (Influcence of a floating plane......) Arizona
05/16/2003 02:32 university
PM
A quick note, since no-one else replied.
This is contrary to my intuition and what a simple XFX simulation shows.
Adding a 2nd plane above the signal lowers Leff in that simulation. So,
I'm surprised also.
without plane above:
i j Lij Cij Ze Zo Se So Fwdx Rvsx
from to (nh/in) (pf/in) (ohms) (ohms) (ns/ft)(ns/ft) (s/s) (v/v)
--------------------------------------------------------------------------
1 1 8.963 1.363 81.09 - 1.33 - - -
with plane (conductor 2)above
i j Lij Cij Ze Zo Se So Fwdx Rvsx
from to (nh/in) (pf/in) (ohms) (ohms) (ns/ft)(ns/ft) (s/s) (v/v)
--------------------------------------------------------------------------
1 1 7.076 3.075 49.35 - 1.72 - - -
1 2 0.506 2.378 104.25 34.71 0.87 2.27 -0.890 0.500
2 2 1.018 16.383 8.18 - 1.49 - - -
Jeff Loyer
-----Original Message-----
From: Jean Audet [mailto:jaudet@xxxxxxxxxx]
Sent: Wednesday, May 14, 2003 9:56 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] J.L. Prince (Influcence of a floating plane......)
Arizona university
Around 1996-1997, a presentation have been done by University of Arizona
about the '' Influence of a Floating Plane on Effective Ground Plane in
Thin Film Multilayer and Lead Frame package''
Into this presentation, the effective inductance simulation for a
multilayer package having floating plane above is worst than whitout
floating plane.
Basically the structure (x-section) is the following
Floating plane
Signal
Ground plane
The Leff graph shows a Leff lower for structure whitout floating plane. I'm
little surprise about the simulation results.
Is someone has more data about that... or maybe M. Prince may reply if he
is in the distribution list
Also I have only a hard copy of this presentation, Is someone else has a
soft copy ?
Jean Audet
Electrical Analysis
World Wide Packaging & Test
IBM Burlington
Tel: 802-769-0835, tie line: 446-0835
Tel: 450-534-6317, tie line: 552-6317
E-mail: jaudet@xxxxxxxxxx
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