[SI-LIST] Re: Decoupling Analysis for analog rails
- From: Michael PARKER <michael.parker@xxxxxx>
- To: "bala89si@xxxxxxxxx" <bala89si@xxxxxxxxx>
- Date: Thu, 21 Mar 2013 18:52:26 +0100
Balaji,
I've had some success with modelling ferrites as Steve suggests, but with a
further R in series with the parallel RLC to set a baseline ESR.
TDK's SEAT tool (http://www.tdk.com/seat.php) is very useful for
experimentation with values of RRLC, allowing you to plot Z, R, Y etc. and
match published data from the component manufacturer.
Best regards,
Mike
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Balaji
> G
> Sent: 21 March 2013 09:03
> To: weirsi@xxxxxxxxxx
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Decoupling Analysis for analog rails
>
> 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
> > >
> > > 在 2013-3-21，14:24，"Balaji G" <bala89si@xxxxxxxxx> 写道：
> > >
> > >> 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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