[SI-LIST] Re: Is Impedance Enough for Describing the PDS?
- From: steve weir <weirsp@xxxxxxxxxx>
- To: zhang_kun@xxxxxxxxxx, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 08 Jul 2004 17:33:31 -0700
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
>
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