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:
Nov. 25, 2025
Filed:
Nov. 15, 2021
Iee International Electronics & Engineering S.a., Echternach, LU;
Laurent Lamesch, Reichlange, LU;
Tobias Justinger, Hermeskeil, DE;
Michael Pütz, Trier, DE;
Thomas Faber, Schweich, DE;
Christoph Wendt, Trier, DE;
Johnny Lorang, Schieren, DE;
IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., Echternach, LU;
Abstract
An impedance measurement circuit for determining a complex impedance of a capacitive sensor having at least one sense electrode operable in loading mode and at least one guard electrode. The measurement circuit includes: a pulse generator unit for providing a periodic electric measurement signal and a periodic electric guard signal; a signal sensing circuit for sensing a sense current flowing through the at least one sense electrode or the sense electrodes in response to the pulse generator unit measurement signal; and a control and evaluation unit. The control and evaluation unit is configured for determining a complex impedance from the determined sense currents with reference to a complex reference potential.