[SI-LIST] Re: Target Impedance in PCB power plane...

Padmanaban, the short answer is that the impedance needs to be 
controlled over the spectrum of load current that is significant.  If 
the current spectrum is well known and controlled, the impedance 
response can be optimized.

Steve.
At 11:01 PM 9/18/2006, Padmanaban Balamuraleedharan - TLS, Chennai wrote:
>Content-Transfer-Encoding: quoted-printable
>Content-Type: text/plain;
>         charset="Windows-1252"
>Hi all,
>=20
>Whether target impedance of power plane needs to be kept below certain =
>value
>throughout the operating spectrum? if yes, Why? Current consumption at
>different frequencies are different in the spectrum, right? Eg, =
>Switching
>current consumption occurs at multiples of its fundamental switching
>frequencies at different magnitudes. So we need to consider the current
>distribution instead of switching current alone. If I'm wrong, correct =
>me.
>How we need to fix the threshold limit for the target impedance of the =
>power
>plane throughout the operating frequency?
>=20
>Thanks in advance.
>=20
>Regards,
>Padmanaban
>DISCLAIMER=20
>The contents of this e-mail and any attachment(s) are confidential and =
>intended for the=20
>
>named recipient(s) only. It shall not attach any liability on the =
>originator or HCL or its=20
>
>affiliates. Any views or opinions presented in this email are solely =
>those of the author and=20
>
>may not necessarily reflect the opinions of HCL or its affiliates. Any =
>form of reproduction,=20
>
>dissemination, copying, disclosure, modification, distribution and / or =
>publication of this=20
>
>message without the prior written consent of the author of this e-mail =
>is strictly=20
>
>prohibited. If you have received this email in error please delete it =
>and notify the sender=20
>
>immediately. Before opening any mail and attachments please check them =
>for viruses and=20
>
>defect.
>
>
>
>-- Binary/unsupported file stripped by Ecartis --
>-- Type: image/jpeg
>-- File: Notebook.jpg
>
>
>------------------------------------------------------------------
>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
>

------------------------------------------------------------------
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: