US 12,130,360 B2
Ultrasound transmitter device for driving piezoelectric transducers
Antonio Davide Leone, Siziano (IT); and Vanni Poletto, Milan (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Mar. 3, 2023, as Appl. No. 18/178,110.
Claims priority of application No. 102022000005384 (IT), filed on Mar. 18, 2022.
Prior Publication US 2023/0296769 A1, Sep. 21, 2023
Int. Cl. G01S 7/521 (2006.01); G01S 7/524 (2006.01); G01S 15/93 (2020.01); G01S 15/931 (2020.01); G01S 7/52 (2006.01); H04R 17/00 (2006.01)
CPC G01S 15/931 (2013.01) [G01S 7/521 (2013.01); G01S 7/524 (2013.01); G01S 2007/52007 (2013.01); G01S 2015/937 (2013.01); H04R 17/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ultrasound transmitter device, comprising:
a center tap transformer comprising a primary winding having a central terminal coupled to a first node configured to provide a dc voltage, and a secondary winding configured to be coupled to a piezoelectric transducer;
a plurality of transistors coupled to the primary winding of the center tap 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.