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

From: Istvan Novak - Board Design Technology ([email protected])
Date: Fri Aug 18 2000 - 12:36:47 PDT

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Larry,

thanks for your note. I was just very busy until now...

Istvan

        Date: Fri, 18 Aug 2000 10:03:43 -0700 (PDT)
        From: Larry Smith <[email protected]>
        Subject: RE: [SI-LIST] : Decoupling capacitors (again!)
        To: [email protected], [email protected]
        Cc: [email protected], [email protected],
[email protected]
        MIME-Version: 1.0
        Content-MD5: RDZgL/9Xr40qQJpkJt+OEg==
        
        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
<[email protected]>
> Subject: RE: [SI-LIST] : Decoupling capacitors (again!)
> To: [email protected]
> Cc: [email protected], [email protected],
[email protected]
> 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: [email protected] Thu Aug 17 17:34:42
2000
> From: "Larry Miller" <[email protected]>
> To: Martin J Thompson <[email protected]>, si-list
> <[email protected]>
> 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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Istvan Novak Sun Microsystems, Inc.
[email protected] Workgroup Servers, BDT Group,
                        One Network Drive, Burlington, MA 01803
                        Phone: (781) 442 0340

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