公开(公告)号：US09329610B2

公开(公告)日：2016-05-03

申请号：US13921033

申请日：2013-06-18

Applicant: STMicroelectronics S.r.l.

Inventor： Filippo David ,  Alessandro Gasparini

IPC: H04R3/00 ,  G05F1/46 ,  H02M3/07

CPC classification number: G05F1/467 ,  H02M3/07

Abstract: A biasing circuit for an acoustic transducer is provided with: a voltage-booster stage, which supplies, on a biasing terminal, a boosted voltage for biasing a first terminal of the acoustic transducer; and filtering elements, set between the biasing terminal and the acoustic transducer, for filtering disturbances on the boosted voltage. The biasing circuit is further provided with switches, which can be actuated so as to connect the first terminal to the biasing terminal of the voltage-booster stage, directly during a start-up step of the biasing circuit, and through the filtering elements at the end of the start-up step.