RE: [SI-LIST] : Differential TDR probes

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From: Daniel, Erik S. (Daniel.Erik@mayo.edu)
Date: Thu Oct 19 2000 - 15:26:16 PDT


Fabrizio-

A couple things we have used with some success for diff TDR on PC boards and
chip packages:

1. GGB Picoprobe Model 10
--------------------------
These are micro-coax probes with needle-like tips connected at the end.
They are pretty cheap, and there are a wide variety of options (different
needle tip lengths, widths, materials, ...). We have used two ground-signal
style probes soldered together to form a GSSG style differential probe. The
needles are flexible and can be bent to accommodate different board
geometries (although bending the needles too much definitely degrades the
launch). There are some technical drawbacks to these, but they have come in
handy for troubleshooting.

2. GGB Picoprobe Model 40A Dual probes
---------------------------------------
These are very good microwave probes (with an advertised 40 GHz bandwidth)
that you can buy in GSSG or GSGSG styles in a variety of pitches. They are
fairly expensive, the lead times are long for custom orders, and I would not
recommend trying to bend these(!) to accommodate different geometries, but
they are electrically very good.

There are a number of other similar microwave probes we have used in various
special cases, but I think I have used these two options the most.

                                        - Erik

==================================================================
Erik Daniel, Ph.D. Mayo Foundation
Voice: (507) 284-1634 Guggenheim 1011B
Fax: (507) 284-9171 200 First Street SW
E-mail: daniel.erik@mayo.edu Rochester, MN 55905
==================================================================

> -----Original Message-----
> From: zanella, fabrizio [mailto:zanella_fabrizio@emc.com]
> Sent: Thursday, October 19, 2000 2:44 PM
> To: SI List (E-mail)
> Subject: [SI-LIST] : Differential TDR probes
>
>
> We're having problems getting a good high frequency launch
> when probing pc
> boards and cable differential pairs when taking TDR
> measurements.Has anyone
> found good differential TDR probes which allow you to measure
> very closely
> spaced points on pc boards or cables?
>
> Thanks and regards,
> Fabrizio Zanella
> Hardware Engineering
> EMC Corporation
> fzanella@emc.com
>
>
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