Measuring noise -- bw limiting
- From: "Johnson" <jdwalton@xxxxxxxx>
- Date: Fri, 5 Aug 2005 10:14:28 -0400
The noise measurements I have been doing utilize a Tektronix or Boonton
distortion analyzer -- the Boonton is "in cal" and for sine waves the TEK
and Boonton mate perfectly up to 100kHz -- both use the Analog Devices AD536
log converter chips. The Boonton uses a 2.2uF timing (averaging) capacitor
and the TEK 4.7uF -- so there are some obvious differences when measuring
low levels of random noise.
The noise measurement articles (noise from regulators, power supplies,
batteries, diodes, references) are bandwidth limited -- sometimes 100
milliHz to 10 Hz, sometimes across the audio band, sometimes to 100kHz --
the question is "which horse for which course?" -- and is it reliable to
measure noise when a log converter is used (or the new delta-sigma
converters from Linear Tech) or should I rely instead on the thermopile of a
defunct HP 3403C?
FWIW, Linear no longer manufactures the LT1088.
.
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