FreeLists / si-list / [SI-LIST] Re: how to extract RLC values for package

[Ke Wang <wolfkid72@xxxxxxxxx>]

Name a couple - Q3D, ICE MAX, HFSS (for really high
frequency)

--- Prathibha <prathibha@xxxxxxxxxxxxxxx> wrote:

> 
> Hi Gurus ,
> 
> How can we get the RLC values for a package ?.  We
> have extracted package
> model, but could not get a combined RLC values . We
> are using APD for
> designing the package .
> 
> Please advise .
> 
>  Thanks and Regards,
>  Prathibha
> 
> 
> 
> 
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of
> Istvan Novak
> Sent: Thursday, May 04, 2006 6:40 PM
> To: GStokes@xxxxxxxxx
> Cc: SI-List
> Subject: [SI-LIST] Re: Routing Signals Between PWB
> Layers - Part 2
> 
> 
> Geoff, Doug,
> 
> This example nicely shows the importance of proper
> power distribution
> design.
> 
> The emission peaks correspond to the modal
> resonances of the PCB planes.
> As Doug points out in the article, moving the planes
> closer would reduce the
> emission about proportionally.  However, if one
> wants to stay with a
> four-layer
> construction, reducing the plane separation is not a
> viable solution: it
> would
> either result in an unmanageably thin board, or if
> we add the tickhness
> back to
> the top/bottom dielectrics, in a dramatically
> reduced routing density.
> 
> Nearby grounding vias would help, but in practical
> cases the two planes
> are at
> different DC potentials, so it must be a bypass
> capacitor rather than a
> stitching
> via.  A single bypass capacitor will do little in
> the hundreds of MHz
> frequency range,
> even if it serves only one signal.  Also, if we have
> wide busses instead
> of a single
> trace, trying to provide a return path locally to
> all of the layer
> transitions becomes
> much harder to implement.
> 
> A more realistic and straightforward solution is to
> design the
> power-distribution
> network in such a way that it does not exhibit large
> resonances.  In
> multi-layer
> boards, where we may also have ground-ground planes
> creating such
> cavities, the
> solution is stitching vias, but not necessarily near
> the layer
> transitions.  We would
> just need to make sure that the large resonating
> cavity is broken up to
> sufficiently
> small blocks such that the lowest resonance
> frequency is safely above
> the highest
> frequency of excitation.
> 
> Regards,
> 
> Istvan Novak
> SUN Microsystems
> 
> 
> 
> Geoff Stokes wrote:
> 
> >Hi Doug
> >
> >In this experiment, you appear to have no plane
> vias adjacent to the
> >signal vias.  What would happen if a few plane vias
> were added around
> >the transitions and fairly close by?
> >
> >Geoff Stokes
> >Systems Engineer
> >Zetex Semiconductors plc
> >Zetex Technology Park
> >Chadderton
> >Oldham
> >OL9 9LL
> >UK
> >=20
> >+44-161-622-4857
> >www.zetex.com
> >www.zetex.cn
> >=20
> >
> >=20
> >-----Original Message-----
> >From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> >On Behalf Of Doug Smith
> >Sent: 03 May 2006 21:41
> >To: SI-List
> >Subject: [SI-LIST] Routing Signals Between PWB
> Layers - Part 2
> >
> >Hi All,
> >
> >I have been writing and recording again and have
> posted part 2 of my=20
> >article on signals that change layers in a PWB.
> >
> >Abstract: Printed wiring board, PWB, signal paths
> must often change=20
> >layers in a board stackup. Under some conditions
> this can cause=20
> >problems. An emissions example is used to
> illustrate the conditions=20
> >where changing layers can cause problems.
> >
> >The link to the article is the picture of the
> emissions plot at the=20
> >bottom of the home page at http://emcesd.com .
> >
> >There is also an audio discussion of this article
> on my podcast site:=20
> >http://emcesd-podcast.com where the direct link to
> the article is:
> >
> >http://emcesd-podcast.com/2006/may/2006-0503.mp3
> >
> >Can't download mp3 files? Download the following
> instead:
> >
> >http://emcesd-podcast.com/2006/may/2006-0503.dcs
> >
> >After download, change the extension from .dcs to
> .mp3 and the file=20
> >will then be able to play on most computers. Since
> the last HFNews=20
> >there have been two new podcasts posted.
> >
> >Doug
> >--=20
>
>-------------------------------------------------------
> >     ___          _       Doug Smith
> >      \          / )      P.O. Box 1457
> >       =3D=3D=3D=3D=3D=3D=3D=3D=3D          Los
> Gatos, CA 95031-1457
> >    _ / \     / \ _       TEL/FAX:
> 408-356-4186/358-3799
> >  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
> >|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
> >  \ _ /    ]    \ _ /     Website:
> http://www.dsmith.org
>
>-------------------------------------------------------
> >
> >
> >
>
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