公开(公告)号：US20200382085A1

公开(公告)日：2020-12-03

申请号：US16828550

申请日：2020-03-24

Applicant: Hitachi, Ltd.

Inventor： Shinya KAJIYAMA ,  Tadahiro NABETA

IPC: H03F3/45 ,  H03F1/52

Abstract: An amplifier circuit includes a potential relation between a common emitter amplifier circuit (amplifier circuit body) including an NPN transistor (bipolar transistor) and a clamp circuit which maintains a potential relation between a base-collector of the NPN transistor of the common emitter amplifier circuit. The clamp circuit includes a level shift circuit and a clamp diode for suppressing a decrease in the collector potential of the NPN transistor of the common emitter amplifier circuit.

公开(公告)号：US20210386401A1

公开(公告)日：2021-12-16

申请号：US17229916

申请日：2021-04-14

Applicant: HITACHI, LTD.

Inventor： Shinya KAJIYAMA ,  Yoshihiro HAYASHI ,  Tadahiro NABETA

IPC: A61B8/00 ,  B06B1/02 ,  G01S15/89

Abstract: Provided are a two-dimensional array ultrasonic probe and an addition circuit that switch an addition unit of a reception signal according to a reception channel of a main unit while preventing an increase in a chip area. The addition circuit includes, between addition output terminals that output an addition signal and transducer channels, wirings provided for each transducer channel row including the transducer channels arranged in a vertical direction on a subarray basis and coupled to the transducer channels of the corresponding transducer channel row, output switches provided for each of the wirings and coupled to the corresponding transducer channel row wiring, and an inter-output switch that couples wirings corresponding to transducer channel rows adjacent in the horizontal direction via the output switches.