[SI-LIST] Re: Transfer Impedance of Regular Power Plane Pair
- From: "Zhiping Yang" <zyang@xxxxxxxxxxxxxxxx>
- To: <zhang_kun@xxxxxxxxxx>, "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 26 Oct 2006 20:34:35 -0700
Hi Zhang Kun,
Two things could cause HFSS simulation results differ from theoretical
results. One is boundary condition and the other one is the excitation
port settings.
For your case, most likely it was due to port settings. Did you use via
in your HFSS simulation at the port? The coupling between via and
power/ground planes, and coupling between vias could cause resonant
frequency changes.=20
The theoretical equation is based on certain assumptions. One of them
is that E field is vertical between power/ground planes. In real
simulations, any openings on power/ground plane could invalidate this
assumption, so it is very difficult to match simulation and theoretical
results.
Regards,
Zhiping
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Zhangkun
Sent: Thursday, October 26, 2006 7:10 PM
To: si-list
Subject: [SI-LIST] Transfer Impedance of Regular Power Plane Pair
Dear All
In the current research, we found an interesting result about the
transfer impedance of regular power plane pair. We need some help to
solve the problem. We use HFSS to simulate the impednce of regular power
plane pair. Any advice would be helpful.
According to the theory, the transfer impedance of regular power plane
pair coudl be expressed by means of Double Sigma Function. In the
expression, the thickness of dielectric would not affect the shape of
the impedance. However, in our simulation, we found out that the
frequency location of pole and zero of the impedance is affected by the
thickness of the dielectric.
Reference Paper:
Estimating the Power Bus Impedance of Printed Circuit Boards With
Embedded Capacitance, IEEE Trans on Advanced Package, Aug. 2002
Best Regards
Zhangkun
200610.27
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=20
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