[SI-LIST] Re: FW: Re: Passive Probe
- From: "alfred1520list" <alfred1520list@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 28 Feb 2011 09:49:32 -0800
Hi Orin,
Very thought provoking for those not in the know. I sure
would appreciate a link or two so I could learn more.
----- Original Message -----
From: "Orin Laney" <olaney@xxxxxxxxx>
Sent: Saturday, February 26, 2011 8:46 AM
> On the other hand, a user with a test
> point that itself has a Z of a few ohms can intelligently use a passive 10X
> probe well into VHF. Alas, few users understand the limitations of their
> probes well enough to pull this off.
How do you get a test point with a few ohms of Z? Typical
drivers might be in the teen, and with series termination in
the dozen of ohm. Then if you are in the middle or end (which
is really what you care about) of a trace the trace impedance
is around 50. Do you need a buffer?
What are the limitations? In terms of bandwidth? Phase linearity?
What does one need to know to predict the fidelity of the measurement?
> Even fewer think to deliberately design in suitable test points.
What makes a suitable test points?
Again, I'm not requesting any details explanation here. I am
only looking for a paper or article that I can read and learn.
But if you have a short explanation that would be great.
Thank you very much in advance.
Best Regards,
Alfred Lee
www.mds.com
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