The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2002
Filed:
Jul. 02, 1999
Wolfgang Seils, Ludwigsburg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
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 (U U ) 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.