公开(公告)号：US20240223965A1

公开(公告)日：2024-07-04

申请号：US18092285

申请日：2022-12-31

Applicant: Knowles Electronics, LLC

Inventor： Shenjie Wang ,  René Scheuner ,  Mark Niederberger

IPC: H04R19/04 ,  H03F3/45 ,  H04R1/04

CPC classification number: H04R19/04 ,  H03F3/45475 ,  H04R1/04 ,  H03F2200/165 ,  H04R2201/003

Abstract: A capacitive sensor assembly is disclosed, including a capacitive motor coupled to a charge pump circuit via a low pass filter, and a frontend amplifier circuit having an input coupled to the capacitive motor interface and an output coupled to an output of the electrical circuit. An injection current source (ICS) is coupled to the charge pump circuit output and configured to control voltage across a diode-based resistive element of the low pass filter during a transient startup phase of the charge pump circuit, wherein a settling time of the charge pump is reduced.