Techniques to enhance op amp signal integrity in low-level senso...
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21 August 2009
Techniques to enhance op amp signal
integrity in low-level sensor applications
(Part 1 of 4)
Shielding, grounding, ground loops, common mode,
single-ended, differential mode, induced noise,
isolation, and more: meet and overcome the
challenges of low-level analog signal conditioning
Editor's Note: This lengthy and
insightful article is presented
in four parts:
Part 1: below
Part 2: click here
Part 3: to be posted December
16, 2008
Part 4: to be posted December 18, 2008
Probably nowhere do electronic engineers face such a
difficult challenge as that posed by the threats of EMI
acting on linear amplifiers and sensors at the detection and
pre-conditioning stages of long, sensor-instrumentation
loops, such as those found in industrial-measurement and
control. Obtaining and maintaining the quality of these
measurements in harsh signal environments is the goal of
proper signal conditioning. The use of un-amplified sensor
signals, is still the most common way of conveying analog
signals, representing temperature, pressure, displacement,
force, and many other physical variables, to conditioning
circuits via signal wires.
By Jerry Freeman, Applications
Engineer, National Semiconductor Corp.
Planet Analog
A? 9, 2008 (7:00 H EST)
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