[SI-LIST] Re: Query related to Decoupling Analysis and Ferite Bead
- From: Jagdish Goswami <jagdishgoswami@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 3 Feb 2014 13:07:57 +0530
Thanks istvan Novak and Steve weir for the reply.
FB is drawing ~ 3A of current from n1(1.375V), because of this the target
impedance is coming very low ~ 19.5 mOhm (@ FB)
I simulated the sinario and found that the plane impedance graph (of n1) at
the input of FB is going above target impedance @ 1MHz. does that means
decoupling is Required even at the input of Ferrite bead?
On Mon, Feb 3, 2014 at 12:37 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> Up to the cut-off frequency formed by the ferrite bead and whatever
> decoupling is at (n2), both the (n2) decoupling and loads couple to (n1).
>
> Steve
> On 2/2/2014 10:51 PM, Jagdish Goswami wrote:
> > Dear Experts
> > I am new to pi analysis and need your help in solving one of the basic
> > Query related to power integrity, Please help me out in resolving this
> > query.
> >
> >
> >
> > The scenario of my board is given below
> >
> > VRM----(n1)---->FB----(n2)---->IC1
> > (n1)---->IC2
> >
> >
> > Where
> > n1=Power plane (1.375V)
> > n2=Power Plane (1.375V)
> >
> > output Voltage of VRM = 1.375V
> > Ripple = 2.5%
> >
> > IC1 is drawing ~ 3A of current from plane n2
> >
> > I am doing the Decoupling Analysis of plane n1.
> > so I am assuming FB as one of the sink which is taking 3A of current from
> > n1,
> > target impedance will come out to be only 19.462 mOhm below FB
> >
> > My Query is am i doing it correctly by taking FB as one of the sink with
> 3A
> > of current?
> >
> > Do I need to make sure that the impedence graph is below target impedance
> > even at the input of FB?
> >
> >
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