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:
Aug. 27, 2013
Filed:
Apr. 03, 2009
Josef Lutz, Rohrau, AT;
Josef Lutz, Rohrau, AT;
NXP B.V., Eindhoven, NL;
Abstract
An electronic circuit () for controlling a capacitive pressure sensor (), which capacitive pressure sensor () comprises a plate electrode capacitor (C) with a capacity that varies in dependence on pressure changes exerted on a deflectable diaphragm () forming one plate electrode of the capacitor (C), wherein the electronic circuit () comprises a DC voltage source () being adapted to generate a DC bias-voltage (UDC) to be applied across the electrodes of the capacitor (C), an AC voltage source () being adapted to generate an AC voltage signal (UAC) to be applied across the electrodes of the capacitor (C) and a controller () being adapted to receive an output signal (OUT) of the capacitor (C) and to control the DC voltage source () such that the DC bias-voltage (UDC) applied to the capacitor (C) adopts a value that maintains the capacity of the capacitor (C) at a desired value.