PROBLEM TO BE SOLVED: To provide ultrasonic diagnostic apparatus having a wave transmission circuit capable of outputting voltage with optional amplitude, frequency and waveform.SOLUTION: A current flowing primary windings 2-a1 and 20a2 of a pulse transformer 20a is controlled constant by a constant current source 20d and the controlled current is negatively fed back to a switching part 20c via a negative feedback resistance Rf and a negative feedback capacitor Cf to constitute a linear amplifier. The current of the constant current source 20d is controlled by a current control signal from a current control signal generation circuit 21b, and an optional-waveform voltage obtained by controlling to complementarily conduct MOS field-effect transistors M1 and M2 by the linear amplifier with the optional-waveform control signal from the optional-waveform control signal generation circuit 21a, is defined as the drive voltage of an ultrasonic transducer 6a. The optional-waveform control signal generation circuit 21a consists of an optional-waveform data memory 21a1 and a complementary signal generation circuit 21a2, and the current control signal generation circuit 21b consists of a current control waveform data memory 21b1 and a D/A converter 21b2.COPYRIGHT: (C)2009,JPO&INPIT【課題】任意の振幅、周波数及び波形の電圧を出力できる送波回路を備えた超音波診断装置を提供する。【解決手段】パルストランス20aの一次巻線20a1、20a2に流れる電流を定電流源20dで一定に制御し、負帰還抵抗Rfと負帰還コンデンサCfを介して前記制御された電流をスイッチング部20cに負帰還してリニアアンプを構成する。前記定電流源20dの電流は、電流制御信号発生回路21bからの電流制御信号で制御し、前記リニアアンプにより前記任意波形制御信号発生回路21aからの任意波形制御信号でMOS型電界効果トランジスタM1とM2を相補に導通制御して得られた任意波形の電圧を超音波振動子6aの駆動電圧とする。前記任意波形制御信号発生回路21aは、任意波形データメモリ21a1と相補信号発生回路21a2で構成し、前記電流制御信号発生回路21bは、電流制御波形データメモリ21b1とD/A変換器21b2で構成する。【選択図】 図2
