[SI-LIST] Re: how to evaluate the lead inductance of chippackages

Lee, no problem.  Have a Merry Christmas.

Steve.
At 12:51 PM 12/22/2005 -0800, Lee Ritchey wrote:
>Got it.  Sorry for the confusion on my part.
>
>Lee W. Ritchey
>Speeding Edge
>P. O. Box 2194
>Glen Ellen, CA 95442
>Phone- 707-568-3983
>FAX-    707-568-3504
>
>I just used the energy it took to be angry to write some blues.
>Count Basie
>
>
> > [Original Message]
> > From: steve weir <weirsi@xxxxxxxxxx>
> > To: <leeritchey@xxxxxxxxxxxxx>; david <zhao.dave@xxxxxxxxx>;
><si-list@xxxxxxxxxxxxx>
> > Date: 12/21/2005 9:40:13 AM
> > Subject: [SI-LIST] Re: how to evaluate the lead inductance of chippackages
> >
> > Lee, David clarified to me that he was trying to understand the basis for
> > fixed L numbers in an IBIS model.  So in his circumstance, the assumption
> > was that all of the elements were small enough to treat each as lumped.
> >
> > Steve.
> > At 09:18 AM 12/21/2005 -0800, Lee Ritchey wrote:
> > >This whole explanation ignores the distributed capacitance along the
>length
> > >of the lead.  This is not a good thing to do for very fast signals.
> > >
> > >Lee W. Ritchey
> > >Speeding Edge
> > >P. O. Box 2194
> > >Glen Ellen, CA 95442
> > >Phone- 707-568-3983
> > >FAX-    707-568-3504
> > >
> > >I just used the energy it took to be angry to write some blues.
> > >Count Basie
> > >
> > >
> > > > [Original Message]
> > > > From: david <zhao.dave@xxxxxxxxx>
> > > > To: <si-list@xxxxxxxxxxxxx>
> > > > Date: 12/20/2005 5:46:46 PM
> > > > Subject: [SI-LIST] how to evaluate the lead inductance of chip
>packages
> > > >
> > > > Dear sir,
> > > >        Whenever we analyzed the inductance of a circuit, we have to
> > >consider
> > > > the loop. Whatever mutual inductance or self-inductance were
>mentioned, we
> > > > all need to calculate the area of the loop that was constructed by the
> > > > forward signal line and the back power plane. That was easy to be
> > > > comprehended, in terms of the concept of induction, we had to
> > > > understand that the change of flux led to the loop current. And in
>this
> > > > situation, the inductance distributed in the loop nearly uniformly.
>But
> > > > most time, we extracted the lead inductance out of the integrated
>value of
> > > > the loop, and considered it separately. It seemed that the lead had a
> > > > inherent inductance which wasn't related to the area of the loop. But
>I
> > > > couldn't comprehended how a straight wire, other than loop, could
>possess
> > > > the inductance. No area No flux.
> > > > Thanks a lot.
> > > >
> > > > --
> > > > BEST WISHES
> > > >
> > > > Joey.zhao
> > > >
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