[SI-LIST] Re: DC-26 GHz Picoprobe
- From: John Wilson <jmwilson@xxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 01 Apr 2004 10:03:29 -0500
Neven,
We have a Model 35 probe, however, I have never used it. I will forward
this message to someone in our group that has used the Model 35.
...but I can tell you this, with regard to you concerns about not having
a reference point on the probe. We also have Model 34 probes (100fF,
10Mohm, 3.5GHz) and they also only use a single point. I had the same
concerns before I used the Model 34 and I can tell you that they work
great. The probe does have a grounding strap that you can connect to
ground as close as possible to the chip.
john
npischl wrote:
> Hello,
>
> Is anyone on the list using GGB Industries' active probes e.g.
>
> www.ggb.com/35.html ?
>
> For this Model 35 probe, they claim DC-26 GHz response with 1.25
> MOhm nominal resistance in parallel with 0.05 pF.
>
> They also claim that the probe uses single-point probe tip only (no
> reference point)!! Since voltage is field integral between two
> points in space, I have problem with this claim. Has anyone verified
> the performance? They don't want to disclose the base for that
> claim, saying it is proprietary information. Hm....
>
> I still thinik the probe might be pretty good in a differential
> configuration with two probes used, but I would appreciate any on-
> line or off-line feedback if you use it.
>
> Thanks, Neven
>
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