[SI-LIST] Heisenberg and signal measurements

  • From: Doug Smith <doug@xxxxxxxxxx>
  • To: SI-List <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 06 Oct 2003 16:32:06 -0700

Hi Everyone,

It's that time again this month and I have finished my latest article. 
Most of us worry about probe response when measuring a signal in the 
lab, but the probe's effect on the signal can be significant, 
especially for active probes older than a year or two. I have included 
the abstract for the article below on my site (http://emcesd.com). 
Page down to the bottom of the index page (past the 80 or 90 other 
articles) and click on the waveform graphic to read the article.

Abstract: Heisenberg's Uncertainty Principle might be adapted in the 
context of signal measurements to say that one cannot measure a 
voltage at a node without affecting it. Simulation data is presented 
to show that under realistic conditions, active probes without damping 
resistors can significantly affect the signal to be measured. The 
result can be more serious than just signal loading.

----------

Upcoming event: My 2 day High Frequency Measurements and Noise in 
Electronic Circuits course at Oxford University in November. For 
details go to the Oxford site:

http://www.conted.ox.ac.uk/cpd/electronics/courses/high_frequency_measurements.asp

If the above URL breaks into two lines, use cut and paste to enter the 
URL into your web browser.

Many US airlines are running sales to the UK for as little as about 
US$200! It may be less expensive to fly from Denver to London than 
from Denver to Boston in the US. And... Oxford is a great place to visit.

Doug
-- 
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     ___          _       Doug Smith
      \          / )      P.O. Box 1457
       =========          Los Gatos, CA 95031-1457
    _ / \     / \ _       TEL/FAX: 408-356-4186/358-3799
  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
  \ _ /    ]    \ _ /     Website: http://www.dsmith.org
-------------------------------------------------------

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