Bridge sensor linearization circuit and method
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United States of America Patent
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Mar 6, 2001
Grant Date -
N/A
app pub date -
Jan 14, 1999
filing date -
Jan 14, 1999
priority date (Note) -
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Abstract
A linearization circuit includes a sensor circuit having a first terminal receiving an excitation voltage, and second and third terminals producing a sensor output voltage therebetween. A differential amplifier circuit produces a linearization current, and a scaling circuit operates to produce a scaled linearization current in response to the linearization current. A current direction switch circuit includes a fourth terminal receiving the scaled linearization current, a fifth terminal and conducting a correction current proportional to the linearization current, and a control terminal receiving a polarity control signal to determine the direction of flow of the correction current through the fifth terminal in response to the sensor output voltage. An amplifier circuit receives and amplifies a reference voltage to produce the excitation voltage, the amplifier circuit including a feedback circuit, the feedback circuit being coupled to the fifth terminal and modulating the feedback circuit in response to the correction current to cause the amplifier circuit to produce the excitation voltage equal to the reference voltage plus or minus a positive or negative correction, respectively, according to the level of the polarity control signal and according to the magnitude of the sensor output voltage.
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