PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic device in which a driving current of a vibrator is constant for semiconductor process variations.SOLUTION: An ultrasonic diagnostic device includes a vibrator, a driving signal generation unit, and a transmission circuit for outputting a driving current according to the driving signal and driving the vibrator. The transmission circuit consists of a current mirror of a low voltage transistor and a high voltage transistor, and is composed of a vibrator driving unit in which the high voltage transistor is connected to the vibrator, and a current source for supplying an operation current according to the driving signal to the low voltage transistor of the vibrator driving unit. The driving signal generation unit includes a transmission circuit driving unit replica whose configuration is the same as that of the vibrator driving unit, and a feedback control unit for detecting a current flowing through the high voltage transistor of the transmission circuit driving unit replica, and controlling the current to be constant.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】半導体プロセスバラつきに対して振動子の駆動電流が一定となる超音波診断装置を提供する。【解決手段】振動子と、駆動信号を生成する駆動信号生成部と、駆動信号に応じた駆動電流を出力し、振動子を駆動する送信回路と、を備える超音波診断装置であって、送信回路は、低電圧トランジスタと高電圧トランジスタとのカレントミラーから成り、振動子に高電圧トランジスタが接続される振動子駆動部と、振動子駆動部の低電圧トランジスタに駆動信号に応じた動作電流を供給する電流源から構成され、駆動信号生成部は、振動子駆動部と同じ構成である送信回路駆動部レプリカと、送信回路駆動部レプリカの高電圧トランジスタに流れる電流を検出し、電流を一定に制御するフィードバック制御部と、を備えている。【選択図】図１
