公开(公告)号：US20230366767A1

公开(公告)日：2023-11-16

申请号：US17741718

申请日：2022-05-11

Applicant: Infineon Technologies AG

Inventor： Constantin CRISU ,  Dan-Ioan-Dumitru STOICA ,  Cesare BUFFA ,  Alessandro CASPANI

IPC: G01L25/00 ,  H03F3/183 ,  G01R31/52 ,  G01L1/14

CPC classification number: G01L25/00 ,  H03F3/183 ,  G01R31/52 ,  G01L1/142 ,  H03F2200/03 ,  H04R19/04

Abstract: A capacitive sensor includes a first conductive structure and a second conductive structure that form a first capacitor having a first capacitance that changes in response to an external force acting thereon and includes a MEMS output configured to output a first sense signal representative of the first capacitance; a second capacitor coupled to the MEMS output and configured to output a second sense signal based on the first sense signal; an amplifier comprising an amplifier input and configured to output an amplified signal based on the second sense signal; and a diagnostic circuit configured to receive two measurement signals, generate an offset measurement based on the two measurement signals, and detect a fault on a condition that the offset measurement is outside of a threshold range.

公开(公告)号：US20240213997A1

公开(公告)日：2024-06-27

申请号：US18146641

申请日：2022-12-27

Applicant: Infineon Technologies AG

Inventor： Dan Ioan Dumitru STOICA ,  Constantin CRISU ,  Constantin STROI ,  Vlad BUICULESCU ,  Matthias BÖHM ,  Alessandro CASPANI ,  Cesare BUFFA ,  Franz Michael DARRER

IPC: H03M1/34 ,  G10L21/0232 ,  H03M1/06

CPC classification number: H03M1/34 ,  G10L21/0232 ,  H03M1/0626

Abstract: A sensor circuit, having a startup phase and an operation phase, includes: a sensor configured to generate a sensor signal based on a measured property, wherein the sensor signal has a frequency spectrum defined by a first frequency and a second frequency that is greater than the first frequency; a signal processing circuit including an analog-to-digital converter (ADC) configured to convert the sensor signal into a digital sensor signal; and an offset diagnosis circuit. The offset diagnosis circuit includes: a low pass filter having a cutoff frequency less than the first frequency and configured to generate a filtered signal based on the digital sensor signal; an offset register configured to store a startup signal value of the filtered signal during the startup phase; and an offset comparator circuit configured to set a threshold range based on the startup signal value for use during the operation phase.

公开(公告)号：US20230064937A1

公开(公告)日：2023-03-02

申请号：US17463753

申请日：2021-09-01

Applicant: Infineon Technologies AG

Inventor： Dan-Ioan-Dumitru STOICA ,  Cesare BUFFA ,  Alessandro CASPANI ,  Constantin CRISU ,  Victor POPESCU-STROE ,  Bernhard WINKLER

IPC: G01R31/64 ,  G01R27/26 ,  G01R35/00

Abstract: A capacitive sensor includes a first electrode structure; a second electrode structure that is counter to the first electrode structure, wherein the second electrode structure is movable relative to the first electrode structure and is capacitively coupled to the first electrode structure to form a capacitor having a capacitance that changes with a change in a distance between the first electrode structure and second electrode structure; a signal generator configured to apply an electrical signal at an input or at an output of the capacitor to induce a voltage transient response at the output of capacitor; and a diagnostic circuit configured to detect a fault in the capacitive sensor by measuring a time constant of the first voltage transient response and detecting the fault based on the time constant and based on whether the first electrical signal is the pull-in signal or the non-pull-in signal.