公开(公告)号：US09426563B2

公开(公告)日：2016-08-23

申请号：US14030584

申请日：2013-09-18

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro Gasparini ,  Daniele Depascalis

IPC: H04R3/00 ,  H04R19/01 ,  H04R29/00

CPC classification number: H04R3/00 ,  H04R19/013 ,  H04R29/001

Abstract: A MEMS speaker device including a membrane that forms a first capacitor and a second capacitor, respectively, with a top plate and with a bottom plate. The device includes a driving circuit that operates, during a first operating period, to move the membrane into a first position, in which the membrane is close to the bottom plate, and during a second operating period, to move the membrane into a second position, in which the membrane is close to the top plate. The device includes a testing circuit having a measuring circuit, which generates a first signal, based on a capacitance of one of the first capacitor and the second capacitor and a second signal based on a capacitance of one of the first capacitor and the second capacitor; and a comparator, which compares the first and second signals with at least one first electrical reference quantity.

Abstract translation: 一种MEMS扬声器装置，包括分别与顶板和底板形成第一电容器和第二电容器的膜。 该装置包括驱动电路，该驱动电路在第一操作期间操作以将膜移动到第一位置，其中膜靠近底板，并且在第二操作期间，将膜移动到第二位置 ，其中膜接近顶板。 该装置包括具有测量电路的测试电路，其基于第一电容器和第二电容器之一的电容产生第一信号，基于第一电容器和第二电容器之一的电容产生第二信号; 以及比较器，其将第一和第二信号与至少一个第一电参考量进行比较。