公开(公告)号：US20220013984A1

公开(公告)日：2022-01-13

申请号：US17360381

申请日：2021-06-28

Applicant: STMicroelectronics (Rousset) SAS ,  STMicroelectronics S.r.I.

Inventor： Romeo Letor ,  Vanni Poletto ,  Antoine Pavlin ,  Nadia Lecci ,  Alfio Russo

IPC: H01S5/062 ,  H01S5/026 ,  H03K5/07

Abstract: An embodiment pulse generator circuit comprises a first electronic switch coupled between first and second nodes, and a second electronic switch coupled between the second node and a reference node. An LC resonant circuit comprising an inductance and a capacitance is coupled between the first and reference nodes along with charge circuitry comprises a further inductance in a current flow line between a supply node and an intermediate node in the LC resonant circuit. Drive circuitry of the electronic switches repeats, during a sequence of switching cycles, charge time intervals, wherein the capacitance in the LC resonant circuit is charged via the charge circuit, and pulse generation time intervals, wherein a pulsed current is provided to the load via the first and second nodes. The charge and pulse generation time intervals are interleaved with oscillation time intervals where the LC resonant circuit oscillates at a resonance frequency.

公开(公告)号：US20180150093A1

公开(公告)日：2018-05-31

申请号：US15637225

申请日：2017-06-29

Applicant: STMicroelectronics S.r.I.

Inventor： Vanni Poletto ,  Biagio Provinzano

IPC: G05F1/575 ,  H03F3/45 ,  H03K19/003

CPC classification number: G05F1/575 ,  H03F3/45475 ,  H03F3/45511 ,  H03F3/505 ,  H03K17/04206 ,  H03K17/166 ,  H03K17/687 ,  H03K19/00361

Abstract: A (pre) driver circuit includes first and second output terminals configured to be coupled to a power transistor. A differential stage has non-inverting and inverting inputs for receiving an input voltage. The input voltage is replicated as an output voltage across the first and second output terminals as a drive signal for the power transistor. The differential stage includes a differential transconductance amplifier in a voltage follower arrangement configured to provide continuous regulation of a voltage at the first output terminal with respect to the second output terminal.

公开(公告)号：US20230296769A1

公开(公告)日：2023-09-21

申请号：US18178110

申请日：2023-03-03

Applicant: STMicroelectronics S.r.I.

Inventor： Antonio Davide Leone ,  Vanni Poletto

IPC: G01S15/931 ,  G01S7/521

CPC classification number: G01S15/931 ,  G01S7/521 ,  G01S2015/937 ,  H04R17/00

Abstract: In accordance with an embodiment, an ultrasound transmitter device includes a transformer comprising a secondary winding configured to be coupled to a piezoelectric transducer; a plurality of transistors coupled to the primary winding of the transformer and to a ground terminal via a sense resistor; an amplifier having an output coupled to control nodes of the plurality of transistors, a first input coupled to the sense resistor, and second input coupled to a reference resistor; a switching circuit configured to alternately couple control nodes of the plurality of transistors to an output of amplifier and to a reference node via complementary pulse signals, wherein the switching circuit is configured to turn on and turn off the plurality of transistors and operate the plurality of transistors in a push-pull manner; and a digital-to-analog converter having an output coupled to the reference resistor.