[SI-LIST] Re: Spreading Inductance
- From: "Sirisha Godavarthy" <Sirisha.Godavarthy@xxxxxxxxxxxx>
- To: <Tim.J.Nash@xxxxxxxxxxxxx>, "silist" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 18 Sep 2006 18:27:44 +0530
Hi Tim,
I got some info regarding spreading inductance.
Hope it helps.
Plane spreading inductance:
- L of PLANE_CAVITY =3D u0 / 2=F0 * H * (( ln( R2/R1 ) * KPERF ) +
ln( R3/R2 ))
- u0 =3D 31.9nH/square
- H =3D cavity height
- R3 =3D radius from die center to bypass cap ring
- R2 =3D radius from die center to via field edge
- R1 =3D radius from die center to pkg power / ground attachments.
- KPERF scaling factor for perforation in via field
* For perforations small compared to wavelength area ratio
Thanks&Regards,
Sirisha.
Thanks&Regards,
Sirisha.
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Nash, Tim J (EHCOE)
Sent: Friday, September 15, 2006 7:56 PM
To: silist
Subject: [SI-LIST] Spreading Inductance
From what I have gathered, spreading inductance of a plane is =
dimensionless
(i.e. nH/sq) and not a function of the distance between two points, =
rather a
function of aspect ratio of the plane - L x W. So, the size of the =
plane
isn't what affects spreading inductance, but its shape does. Are these =
true
statements? I want to make sure I understand this correctly.
Best Regards,
Tim
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