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

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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