[SI-LIST] Re: Power Integrity (was: UltraCAD ESR and BypassCapacitor Caculator)
- From: Larry Smith <Larry.Smith@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx, ariazi@xxxxxxxxxxxxxxx
- Date: Fri, 15 Aug 2003 16:36:20 -0700 (PDT)
Abe - The advanced micro processor is just a good example where we have
power integrity issues with huge current transients and DC power loss.
We could also have power integrity issues with a low power PLL circuit
where the "filter" for the power supply has some high Q resonances. I
did not mean to imply that high currents had to be involved with power
integrity, but high currents are usually involved in the most
challenging PI problems.
The way I distinguish between PI and SI is that PI only involves power
and ground nodes. SI always involves at least one signal node. You
Usually have to have good PI before you can get good SI but good PI
does not guarantee good SI.
regards,
Larry
> Delivered-To: si-list@xxxxxxxxxxxxx
> From: "Abe Riazi" <ariazi@xxxxxxxxxxxxxxx>
> To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
> Subject: [SI-LIST] Re: Power Integrity (was: UltraCAD ESR and BypassCapacitor
Caculator)
> Date: Fri, 15 Aug 2003 15:27:01 -0700
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> Larry Smith Wrote:
> >
> >
> >
> > Power Integrity involves delivering high current with huge transients. It
is
> > best understood and managed by the concept of target impedance in the
> > frequency domain.
> >
> >
> >
>
> Dear Larry:
>
> By the statement " Power Integrity involves delivering high current with
> huge
transients " are you
> providing a general definition for the term " Power Integrity " or are you
only relating to the
> advanced microprocessor example discussed in that paragraph ?
>
> Thank you.
>
> Abe Riazi
> ServerWorks
>
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