Electrochemical sensing circuit having high dynamic range
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United States of America Patent
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Feb 27, 2007
Grant Date -
Apr 20, 2006
app pub date -
Oct 15, 2004
filing date -
Oct 15, 2004
priority date (Note) -
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Abstract
An electronic sensing circuit for an electrochemical gas sensor cell providing high dynamic range is described. The electronic circuit utilizes an amplifier with a resistive feedback element to provide high sensitivity linear sensing of low detected gas concentrations. The electronic circuit also provides the ability to source sufficient current to prevent the electrochemical gas sensor cell from becoming biased under very high gas concentration conditions. This operation is enabled by adding a non-linear element in the feedback path of the amplifier, which non-linear element begins to conduct during the high gas concentration conditions.
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