公开(公告)号：US20180288547A1

公开(公告)日：2018-10-04

申请号：US15938665

申请日：2018-03-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jean Pierre LASSEUGUETTE ,  Aleksey Sergeyevich KHENKIN ,  Axel THOMSEN

IPC: H04R29/00 ,  B81B7/00 ,  H04R19/04

CPC classification number: H04R29/004 ,  B81B7/008 ,  B81B2201/0257 ,  B81B2207/03 ,  B81C99/003 ,  H04R19/005 ,  H04R19/04 ,  H04R2201/003

Abstract: The disclosure provides a system, comprising: a MEMS capacitive transducer, comprising one or more first capacitive plates coupled to a first node and one or more second capacitive plates coupled to a second node; biasing circuitry coupled to the first node, operable to provide a biasing voltage to the one or more first capacitive plates; and test circuitry coupled to the second node, operable to: selectively apply one or more current sources to the second node, so as to charge and discharge the MEMS capacitive transducer and so vary a signal based on a voltage at said second node between an upper value and a lower value; determine a parameter that is indicative of a time period of the variation of the signal; and determine a capacitance of the MEMS capacitive transducer based on the parameter that is indicative of the time period.