[SI-LIST] Re: Inductance of PWR&GND plane and other signal line
- From: "Chris Chalmers" <cchalmers@xxxxxxxxxxx>
- To: <pluslee0831@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 22 Dec 2004 08:38:11 -0000
PlusLee,
A plane is normally physically wider than
a signal trace. Since a plane is wider then the
current distribution spreads out more across it.
Thus the number of field lines around it decreases
and thus the self inductance decreases.=20
The combination of a power and ground plane next to
each other in a stackup will reduce the total inductance
of each because of the increased mutual inductance.
inductance of power plane ->
Ltotal for power plane =3D self Lpowerplane - Lmutual (where mutual =
is between pwr and gnd)
for more information I strongly recommend you get a book
like Eric Bogatins "signal integrity simplified" or
Dr Johnson's bible.
Thanks
Chris =20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of plus lee
Sent: 22 December 2004 02:25
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Inductance of PWR&GND plane and other signal line
Hi, all experts,
I am a newcomer to learning SI & PI,and have some questions about =
inductance
of power, ground, and signal line.
Why the inductance of PWR&GND plane is less than signal line?
Is the series of many nets or the plane wider than signal?
thanks for your help
Best regard
PlusLee
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=20
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