[SI-LIST] Re: Is Impedance Enough for Describing the PDS?
- From: "Brent DeWitt" <bdewitt@xxxxxxxxxxxxx>
- To: <zhang_kun@xxxxxxxxxx>, <weirsp@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 8 Jul 2004 19:27:59 -0600
Zhangkun,
This is the perspective of an EMC guy. Steve has made a very good point
about both the spatial and frequency dependence of Z. Certainly, the vector
Z at any given point and frequency on the board covers "energy storage,
decoupling, bypassing, and so on" as you suggest. If all you meant to ask
was whether those other terms could be wrapped up for a single frequency and
spatial point, I think you are quite correct. The only difficulty I see is
that some of those other terms may not normally be expressed in the
frequency domain.
With respect,
Brent G DeWitt
Loveland, CO
http://home.ix.netcom.com/~bdewitt
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Zhangkun
> Sent: Thursday, July 08, 2004 7:07 PM
> To: weirsp@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Is Impedance Enough for Describing the PDS?
>
>
> Dear steve
>
> When you put all the decoupling capacitor into one corner of the
> board or distribute them, the impedance of PDS is not same. If I
> only consider power integrity, is impedance of PDS enough?
>
> Best Regards
>
> Zhangkun
> 2004.7.9
> ----- Original Message -----
> From: "steve weir" <weirsp@xxxxxxxxxx>
> To: <zhang_kun@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Sent: Friday, July 09, 2004 8:33 AM
> Subject: [SI-LIST] Re: Is Impedance Enough for Describing the PDS?
>
>
> > Zhangkun, the problem is that the PDS overlaps both signal
> integrity and
> > EMC compliance. If the system rules are done right, then the PDS
> > decoupling problem will eventually reduce to an impedance profile. But
> > that profile is both spatial and frequency dependent. If I
> shove all the
> > decoupling capacitors into one corner of the board I get a very
> different
> > result than if I distribute them.
> >
> > Steve.
> > At 08:04 AM 7/9/2004 +0800, zhangkun 29902 wrote:
> > >Dear all
> > >
> > >When talking about power delivery system with other engineer,
> there are a
> > >lot of element to describe the PDS, such as energy storage,
> decoupling,
> > >bypassing, and so on. I think all these parameter could be
> described by
> > >one element, impedance of PDS.
> > >
> > >Is my point right? Is impedance enough for describing the PDS?
> > >
> > >Best Regards
> > >
> > >Zhangkun
> > >2004.7.9
> > >
> > >------------------------------------------------------------------
> > >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:
> > >//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:
> > > //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:
> > //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:
> > //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:
> //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:
> //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:
//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:
//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:
