Ratiometric device
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United States of America Patent
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Dec 5, 2017
Grant Date -
Apr 21, 2016
app pub date -
Oct 16, 2014
filing date -
Oct 16, 2014
priority date (Note) -
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Abstract
One example discloses a ratiometric device, including: a current source having a first current, a second current different from the first current, and a current-select program; a sensor device responsive to a gas and having a sensor-cold temperature T(cold,sens) in response to the first current and a sensor-hot temperature T(hot,sens) in response to the second current; a reference device having a reference-cold temperature T(cold,ref) in response to the first current and a reference-hot temperature T(hot,ref) in response to the second current; and wherein the ratiometric device includes a temperature difference ratio output based on T(cold,sens), T(hot,sens), T(cold,ref) and T(hot,ref).
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