公开(公告)号：US20240217810A1

公开(公告)日：2024-07-04

申请号：US18090987

申请日：2022-12-29

Applicant: Knowles Electronics, LLC

Inventor： Michael Jennings ,  Steven Boor ,  Divya Kesharwani

IPC: B81B7/02 ,  H02N1/00

CPC classification number: B81B7/02 ,  H02N1/002 ,  B81B2201/0221

Abstract: A microelectromechanical systems (MEMS) sensor, a capacitive MEMS motor sensing circuit and a method are provided. The present application provides a microelectromechanical systems (MEMS) sensor. The MEMS sensor includes a housing having electrical contacts disposed on an exterior of the housing. The MEMS sensor further includes a capacitive MEMS motor disposed in the housing, and an electrical circuit disposed in the housing and being electrically coupled to the electrical contacts. The electrical circuit includes a bias voltage source having an output coupled to an input of the MEMS motor. The electrical circuit further includes a buffer circuit including an amplifier input stage having an input coupled to an output of the MEMS motor. The electrical circuit still further includes a frequency dependent input attenuator including a feedback capacitor and an input attenuator low pass filter, the input attenuator low pass filter having an input coupled to the output of the amplifier input stage and an output coupled to a first terminal of the feedback capacitor, where a second terminal of the feedback capacitor is coupled to the input of the amplifier input stage.