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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: Seils, Wolfgang
Format: Patent
Sprache:eng
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.