公开(公告)号：EP4215974A1

公开(公告)日：2023-07-26

申请号：EP23152162.6

申请日：2023-01-18

Applicant: STMicroelectronics S.r.l.

Inventor： FURCERI, Raffaele Enrico ,  MOLINARI, Luca

IPC: G02B26/10 ,  G02B26/08

Abstract: Techniques to be described herein are based upon the combination of a digital lockin amplifier approach with a numerical method to yield accurate estimations of the amplitude (Asense) and phase (ϕsense) of a sense signal (Sns) obtained from a movement sensor (13) associated with a resonant MEMS device (11), such as a MEMS mirror.
The techniques described herein are efficient from a computational point of view, in a manner which is suitable for applications in which the implementing hardware is to follow size and power consumption constraints.

公开(公告)号：EP4326038A1

公开(公告)日：2024-02-21

申请号：EP23188320.8

申请日：2023-07-28

Applicant: STMicroelectronics S.r.l.

Inventor： ZAMPROGNO, Marco ,  FURCERI, Raffaele Enrico ,  GIANOLLO, Matteo ,  LANGFELDER, Giacomo

IPC: H10N30/80

Abstract: A differential piezoelectric actuator-system (10) includes an inductor (L) and driver-circuit (11, 12) having switches (S1-S6) for transferring energy between first and second actuators (PZT1, PZT2) and the inductor, and between a voltage-supply node (Vbatt) and the inductor. Control circuitry (21) determines whether a next phase in which to operate the driver-circuit is a first charging-phase or a first recovery-phase. The first charging-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the voltage supply node to the inductor; and a third sub-phase to transfer energy from the inductor to the second actuator. The first recovery-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the inductor to the voltage supply node; and a third sub-phase to transfer energy from the inductor to the second actuator.

公开(公告)号：EP3913345A1

公开(公告)日：2021-11-24

申请号：EP21171960.4

申请日：2021-05-04

Applicant: STMicroelectronics S.r.l.

Inventor： ZAMPROGNO, Marco ,  BARBIERI, Andrea ,  FLORA, Pasquale ,  FURCERI, Raffaele Enrico

IPC: G01L9/04

Abstract: A bridge driver circuit (104) applies a bias voltage across first (142) and second (144) input nodes of a resistive bridge circuit (102) configured to measure a physical property such as pressure or movement. A sensing circuit (185) senses a bridge current (Ipbridge, Inbridge) that flows through the resistive bridge circuit (102) in response to the applied bias voltage. A temperature dependent sensitivity of the resistive bridge circuit (102) is determined by processing the sensed bridge current. A voltage output at first (146) and second (148) output nodes of the resistive bridge circuit (102) is processed to determine a value of the physical property. This processing further involves applying a temperature correction in response to the determined temperature dependent sensitivity.