[SI-LIST] Re: Decoupling Analysis for analog rails
- From: Balaji G <bala89si@xxxxxxxxx>
- To: weirsi@xxxxxxxxxx
- Date: Thu, 21 Mar 2013 14:33:21 +0530
Steve,
Thanks for the suggestion. If I understood you correctly, its like
assigning the ferrite with a model & considering analog net as Xnet then
analysis should be done. I am using Cadence PDN Analysis for decoupling,
let me check whether I can do this.
Regards,
Balaji
On Thu, Mar 21, 2013 at 1:59 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> That would not give an accurate result.
>
> Steve.
> On 3/21/2013 1:07 AM, Shao, Peng wrote:
> > Could not you account this ferrite bead into the VRM model?
> > Peng Shao
> >
> > å¨ 2013-3-21ï¼14:24ï¼"Balaji G" <bala89si@xxxxxxxxx> åéï¼
> >
> >> Hi all,
> >> We have analog and digital rails on our board. In case of Digital
> rails,
> >> we assign the VRM as source and provide the Lslew, Rflat, L0, R0 values
> to
> >> it and we get the PDN frequency response. In case of Analog rails where
> we
> >> have a ferrite between the source and load, VRM will not be present if
> an
> >> Analog net is selected. Should I consider the ferrite as source and
> check
> >> for decoupling? Is it a correct way of checking decoupling for analog
> >> rails? I believe most of the tools available doesn't consider the
> ferrite
> >> bead in decoupling analysis eventhough its assigned with a model. I
> will be
> >> happy to implement, if there is a suggestion.
> >>
> >> Regards,
> >> Balaji
> >>
> >>
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