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[SI-LIST] Re: decoupling
- From: Zhineng Fan <Zhineng.Fan@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 12 Jul 2001 12:06:51 -0700
Hi,
what is the frequency range a design should keep the impedance below
7.2mOhms?
Fan
>
> then: (1.8 * .02) 36 mV
> Zt = ---------- = --------- = 7.2 mOhms
> (20 - 15) 5 amps
>
>
> The equation (at least the one published in our paper
>in 1999) assumed a constant target Z from DC to daylight. Our
>view on that has changed since the original publication, but that
>is a different conversation....
>
>
>-Ray
>
>
> >
> >Ken,
> >
> >I've played around with your equation below, but I'm having trouble
getting
> >anything meaningful out of it. Did this come from a book somewhere that
> has an
> >explanation, or is this your own? If it's the latter, do you have a
> >derivation?
> >
> >A couple of specific questions:
> >
> >is 'powersupply' your VCC voltage?
> >where did 0.02 come from? Is this 5% variation divided by 2?
> >
> >Thanks a lot,
> >mark
> >
> >
>
> >Ken Cantrell wrote:
> >
> >> I use Ztarget = (powersupply*0.02)/di/dt, and have stopped using COGs
(ESL
>
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