[SI-LIST] Re: Transfer Impedance of Regular Power Plane Pair

HI, ZhiPing and ZhangKun,

From my simulation experience, I had very consistent simulation &
measurement results for multilayer power structure up to 18GHz.

For HFSS simulation for this type of structure, the size of power/ground
plane (horizontal plane) is much bigger than the thickness of the
substrate between power and ground plane, HFSS generate the initial mesh
is very coarse, therefore the convergence is very slow if without proper
intial mesh seeding.=20

I would like to take a look of your model, you can drop me a mail.

Thank you and Regards,
Yang Rui=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Zhiping Yang
Sent: Friday, October 27, 2006 11:35
To: zhang_kun@xxxxxxxxxx; si-list
Subject: [SI-LIST] Re: Transfer Impedance of Regular Power Plane Pair

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.=3D20

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


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:    =3D20
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
 =3D20

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:    =20
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
 =20


****************************************************************************
This email is confidential and may be privileged.  If you are not the inten=
ded recipient, please delete it and notify us immediately. Please do not co=
py or use it for any purpose, or disclose its contents to any other person.=
 Thank you.
****************************************************************************


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: