RE: [SI-LIST] : Decoupling capacitors (again!)

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From: Larry Smith (ldsmith@lisboa.eng.sun.com)
Date: Fri Aug 18 2000 - 10:03:43 PDT


Istvan - If you are not going to plug your excellent work published at
Design Con 2000, I will! Istvan has shown how to overcome some of the
difficult measurement challenges in:

        "Measuring Milliohms and Picohenrys in Power Distribution Networks"

        http://home.att.net/~istvan.novak/papers.html
        
regards,
Larry Smith
Sun Microsystems

> Date: Thu, 17 Aug 2000 19:09:19 -0400 (EDT)
> From: Istvan Novak - Board Design Technology <inovak@pompom.east.sun.com>
> Subject: RE: [SI-LIST] : Decoupling capacitors (again!)
> To: ldmiller@nortelnetworks.com
> Cc: Martin.J.Thompson@trw.com, si-list@silab.eng.sun.com, istvan.novak@east.sun.com
> MIME-Version: 1.0
> Content-MD5: QhIXje/rJtAFfAzh/CR8vA==
>
> Larry,
>
> If my math is correct, 0.02 ohms at 200MHz represents about 15pH of inductance. Not
> easy, but today we can measure such low values with vector network analyzers. With
> two-port measurements, the limit is really due to the probe configuration and
> connection. With nothing fancy, you can go down to a few picohenrys with the residual
> inductance.
>
> Regards
>
> Istvan Novak
> SUN Microsystems
>
> X-Unix-From: ldmiller@nortelnetworks.com Thu Aug 17 17:34:42 2000
> From: "Larry Miller" <ldmiller@nortelnetworks.com>
> To: Martin J Thompson <Martin.J.Thompson@trw.com>, si-list
> <si-list@silab.eng.sun.com>
> Subject: RE: [SI-LIST] : Decoupling capacitors (again!)
> Date: Thu, 17 Aug 2000 13:51:49 -0700
> MIME-Version: 1.0
>
> Twenty milli-ohms. 0.02 ohm. At 100 MHz. How does one measure such a
> curiosity?
>
> Thanks,
>
> Larry Miller
> (Not the other Larry)

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