[SI-LIST] Re: Query related to Decoupling Analysis and Ferite Bead
- From: Cristian Filip <cris_filip2002@xxxxxxxx>
- To: "istvan.novak@xxxxxxxxxxx" <istvan.novak@xxxxxxxxxxx>, "jagdishgoswami@xxxxxxxxx" <jagdishgoswami@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 5 Feb 2014 18:42:37 -0800 (PST)
Hi Istvan,
What is the purpose of using the ferrite bead in this example? It appears that
the requirements at both nodes (n1) and (n2) are identical (1.375V with max
allowed ripple=2.5%). If those two nodes were connected together and the target
impedance condition met wouldnât that be enough?
Thank you,
Cristian
________________________________
From: Istvan Novak <istvan.novak@xxxxxxxxxxx>
To: jagdishgoswami@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Sent: Monday, February 3, 2014 2:03:24 AM
Subject: [SI-LIST] Re: Query related to Decoupling Analysis and Ferite Bead
Hi Jagdish,
The impedance will not vary much spatially on the planes until you get
up to the tens or hundreds of MHz frequency range (or unless the plane
resistance/inductance was very bad with respect to your target
impedance) and therefore you can expect the ferrite bead to give good
isolation at that high frequency. At lower frequencies your approach is
correct: the ferrite bead, in series to its load on n2, behaves like a
load on n1.
Regards,
Istvan Novak
Oracle
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
>
>Â VRM----(n1)---->FB----(n2)---->IC1
>Â Â Â Â Â Â Â (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
>
>Â 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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