[SI-LIST] Re: Target impedance for power plane
- From: Mohamed Khaleel <gotokhaleel@xxxxxxxxx>
- To: "Lakshmi N. Sundararajan - PTU" <lakshmi.s@xxxxxxxxxxx>
- Date: Thu, 11 Mar 2010 08:55:37 +0530
Hello Lakshmi,
You could have a look at the below webinar. Gives a good insight into this.
http://www.bethesignal.net/bogatin/nma840-selecting-capacitors-p-420.html?cPath=85
Regards,
Khaleel
On Thu, Mar 11, 2010 at 5:01 AM, Lakshmi N. Sundararajan - PTU <
lakshmi.s@xxxxxxxxxxx> wrote:
> Hi Experts!
> Over the last week there has been so many emails on the s-param and
> channel modeling.
>
> I am still in the process of digesting each of your responses.
>
> I would like to thank you all for those wonderful insightful advices and
> observations.
>
>
>
> I have another question on how can I calculate what should be the target
> impedance of power plane?
>
> Suppose, assume I have a V1P2V supply to a IC. V1P2V can be from 1.15V
> to 1.25V.
>
> And the max current when all signals are switching is 800mA.
>
>
>
> Given this requirement, then for this IC, should the power plane
> impedance be 1.15V/0.8A = 1.4ohms
>
> Or should I consider only the ripple on the power which would be 0.1V
> and so the impedance would then be 0.1V/0.8A = 0.125ohm
>
>
>
> Please suggest some pointers incase I am way off.
>
>
> Thanks,
>
> -LN
>
>
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