Active sensor circuit with one or more T-network pairs
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United States of America Patent
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Sep 11, 2007
Grant Date -
Mar 8, 2007
app pub date -
Nov 3, 2006
filing date -
Mar 11, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor circuit is provided that includes at least one pair of interconnected T-networks. Each pair has a first T-network including a first impedance serially connected to second impedance at a first junction and a first variable resistance sensor element connected to the first junction. Each pair also has a second T-network including a third impedance serially connected to a fourth impedance at a second junction and a second variable resistance sensor element connected to the second junction. The sensor circuit further includes an operational amplifier connected to the first T-network of a selected one of the at least one pair of T-networks and a constant voltage source connected to the second T-network of the selected T-network pair.
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