公开(公告)号：US20190326867A1

公开(公告)日：2019-10-24

申请号：US16378872

申请日：2019-04-09

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto DANIONI ,  Alessandro MORCELLI

IPC: H03F3/70 ,  H04R19/04

Abstract: In at least one embodiment, an interface electronic circuit for a capacitive acoustic transducer having a sensing capacitor is provided. The interface electronic circuit includes an amplifier, a voltage regulator, a common-mode control circuit, and a reference generator. The amplifier has an input coupled to an electrode of the sensing capacitor. The voltage regulator is configured to receive a regulator reference voltage, generate a regulated voltage based on the regulator reference voltage, and supply the regulated voltage to a supply input of the amplifier. The common-mode control circuit controls a common-mode voltage present on the input of the amplifier based on a common-mode reference voltage. The reference generator receives a supply voltage and generates the regulator reference voltage and the common-mode reference voltage with respective values that are variable as a function of the supply voltage.