Sensor arrangement producing one output signal depending on sensor internal resistance and another, depending on a measured variable
1. Field of the Invention The sensor circuit arrangement includes a sensor () that produces an alternating voltage sensor signal that varies according to a measured variable; first and second current supplying circuits () connected to respective sensor terminals to apply first and second output volt...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | 1. Field of the Invention
The sensor circuit arrangement includes a sensor () that produces an alternating voltage sensor signal that varies according to a measured variable; first and second current supplying circuits () connected to respective sensor terminals to apply first and second output voltages (UU) to the respective terminals; a counter-coupling network () coupling the current supplying circuits to provide respective constant currents to the sensor () and a sensor signal processing circuit portion. The sensor signal processing circuit portion includes an operational amplifier () connected across the sensor terminals, a low-pass filter () connected to the operational amplifier and a capacitor () connected to the operational amplifier to generate an alternating output signal having an amplitude depending on the magnitude of the measured variable. The low-pass filter produces a filter output signal indicative of a temperature-dependent internal sensor resistance. The sensor is at an ungrounded floating potential so that common-mode interference is compensated. |
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