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.