[SI-LIST] Re: What does it means my Power Plane Impedance
- From: bala <balaseven@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Wed, 8 Sep 2010 15:08:32 +0530
Shahbaz
What simulation you wanna run.IR-drop? or SSN? or Decoupling caps selection?
Power plane's target impedance depends on your voltage and transient
current.We have to choose the decoupling 'value,package and count' based on
power plane's target impedance.
On Wed, Sep 8, 2010 at 2:11 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> 1. Power cavity impedance is the voltage response exhibited by a
> hypothetical current source placed at some specific location within the
> power cavity extents.
>
> 2. Low enough so that the additive noise from all sources remains below
> the allowable noise voltage for each load as attached.
>
> 3. It should be made as low as is needed.
>
> 4. Ohm's Law.
>
> Steve
> Shahbaz Assad wrote:
> >
> >
> > Hi Experts,
> >
> > What does it means by power plane impedance while doing Power Integrity
> analysis.
> >
> > The power plane impedance is kept at mili ohms for a wide range of
> frequencies for better PI.
> >
> > Kindly guide me
> >
> > 1. what does it means by power plane impedance?
> > 2. what should be its nominal value?
> > 3. For better PI, should its value be as small as possible like 2mOhms?
> > 4. if yes? what is the reason.
> >
> >
> > Thanks In advance. I am new to SI and PI
> >
> >
> > Thanks,
> > Shahbaz Assad
> >
> > System design Engineer - WhizzSystems, Inc.
> >
> > _____________________________________
> > Skypes ID: sassad85 |
> > sassad@xxxxxxxxxxxxxxxx
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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> --
> Steve Weir
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--
bala
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