[SI-LIST] Re: J.L. Prince (Influcence of a floating plane......) Arizona university
- From: "Coleman, Dave" <dave.coleman@xxxxxxxxx>
- To: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>, <jaudet@xxxxxxxxxx>,<si-list@xxxxxxxxxxxxx>
- Date: Fri, 16 May 2003 13:17:10 -0700
Do remember, though, that the Leff is a partial inductance - if it is =
truly a floating plane, at the end of the plane boundary, there will be =
another inductance contribution, unless there is a stitch to the other =
reference.
-----Original Message-----
From: Loyer, Jeff=20
Sent: Friday, May 16, 2003 11:33 AM
To: jaudet@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: J.L. Prince (Influcence of a floating
plane......) Arizona university
A quick note, since no-one else replied.
This is contrary to my intuition and what a simple XFX simulation shows. =
=3D
Adding a 2nd plane above the signal lowers Leff in that simulation. =
=3D
So, I'm surprised also.
without plane above:
i j Lij Cij Ze Zo Se So Fwdx =3D
Rvsx =3D20
from to (nh/in) (pf/in) (ohms) (ohms) (ns/ft)(ns/ft) (s/s) =3D
(v/v)=3D20
-------------------------------------------------------------------------=
=3D
-
1 1 8.963 1.363 81.09 - 1.33 - - -
with plane (conductor 2)above=3D20
i j Lij Cij Ze Zo Se So Fwdx =3D
Rvsx =3D20
from to (nh/in) (pf/in) (ohms) (ohms) (ns/ft)(ns/ft) (s/s) =3D
(v/v)=3D20
-------------------------------------------------------------------------=
=3D
-
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 =3D
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. =
=3D
I'm
little surprise about the simulation results.
Is someone has more data about that... or maybe M. Prince may reply if =
=3D
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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