RE: [SI-LIST] : differential impedance calculations

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Wed Nov 01 2000 - 14:04:55 PST


Unfortunately, the piece by Dr Bogatin makes and refers to the very
assumptions that Dr Johnson refers to.
All roads lead to the National App Note AN-905.
(I have been battling this same fight myself.)

Larry Miller

> -----Original Message-----
> From: Charles Grasso [SMTP:chasgra@msn.com]
> Sent: Wednesday, November 01, 2000 2:23 PM
> To: Gary Peterson; si-list
> Cc: eric
> Subject: Re: [SI-LIST] : differential impedance calculations
>
> Hello - There is an excellent presentation available for download called
> "Differential Impedance finally made Simple" authored by Dr Bogatin that
> should help answer this question.
>
> Please goto http://www.ewh.ieee.org/rmcemc Click on Last Meeting and
> follow the instructions for the presentation download.
>
> Enjoy!!
>
> Charles Grasso
> Ansoft Corporartion
> p: 303-666-1400
> f: 303-666-1499
> ----- Original Message -----
> From: "Gary Peterson" <Gary_Peterson@Emcore.com>
> To: <si-list@silab.eng.sun.com>
> Sent: Wednesday, November 01, 2000 12:50 PM
> Subject: [SI-LIST] : differential impedance calculations
>
>
> >
> >
> > I seem to recall Dr. Howard Johnson mentioning that impedance
> calculation
> > formulas made assumptions (since closed-form solutions aren't possible).
> >
> > Can someone comment on assumptions made for the equation for
> differential
> > impedance shown below? Seems to me that as traces get closer together,
> the
> > single ended impedance would be affected. When I calculate single-point
> > values for differential impedance using Hyperlynx LineSim, I do see the
> > single-ended impedance change when the spacing between the pair gets
> small.
> >
> > Thanks,
> >
> > Gary Peterson
> >
> >
> >
> > (Embedded image moved to file: pic27894.pcx)
> >
> >
>
>
>
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