公开(公告)号：US11579273B2

公开(公告)日：2023-02-14

申请号：US17570120

申请日：2022-01-06

申请人： STMicroelectronics S.r.l.

发明人： Marco Passoni ,  Niccolò Petrini

IPC分类号： G01S7/52 ,  B06B1/06 ,  G01S7/524 ,  G01S7/527 ,  G01S15/10 ,  G01S15/931 ,  H01L41/09 ,  H03L7/093

摘要： A method of operating electro-acoustical transducers such as PMUTs involves applying to the transducer an excitation signal over an excitation interval, acquiring at the transducer a ring-down signal indicative of the ring-down behavior of the transducer after the end of the excitation interval, and calculating, as a function of said ring-down signal, a resonance frequency of the electro-acoustical transducer. A bias voltage of the electro-acoustical transducer can be controlled as a function of the resonance frequency. An acoustical signal received can be transduced into an electrical reception signal and a damping parameter of the electro-acoustical transducer can be calculated as a function of the ring-down signal so that a cross-correlation reference signal can be synthesized as a function of the resonance frequency and the damping ratio of the electro-acoustical transducer. Such a cross-correlation reference signal can be used for cross-correlation with the electrical reception signal to improve the reception quality.

公开(公告)号：US11243299B2

公开(公告)日：2022-02-08

申请号：US16810042

申请日：2020-03-05

申请人： STMicroelectronics S.r.l.

发明人： Marco Passoni ,  Niccolò Petrini

IPC分类号： G01S7/52 ,  B06B1/06 ,  G01S7/524 ,  G01S7/527 ,  G01S15/10 ,  G01S15/931 ,  H01L41/09 ,  H03L7/093

摘要： A method of operating electro-acoustical transducers such as PMUTs involves applying to the transducer an excitation signal over an excitation interval, acquiring at the transducer a ring-down signal indicative of the ring-down behavior of the transducer after the end of the excitation interval, and calculating, as a function of said ring-down signal, a resonance frequency of the electro-acoustical transducer. A bias voltage of the electro-acoustical transducer can be controlled as a function of the resonance frequency. An acoustical signal received can be transduced into an electrical reception signal and a damping parameter of the electro-acoustical transducer can be calculated as a function of the ring-down signal so that a cross-correlation reference signal can be synthesized as a function of the resonance frequency and the damping ratio of the electro-acoustical transducer. Such a cross-correlation reference signal can be used for cross-correlation with the electrical reception signal to improve the reception quality.