PROBLEM TO BE SOLVED: To provide a technique of achieving conventional proof pressure required for generating a transmission signal at a target frequency with a transistor having substantially half proof pressure performance.SOLUTION: An ultrasonic diagnostic apparatus comprises: a digital signal generation circuit which generates a digital signal in a positive phase to be a source of a signal for exciting an ultrasonic vibrator and a digital signal in a reversed phase with respect to the digital signal in the positive phase a first level conversion circuit which converts the level of the digital signal in the positive phase a second level conversion circuit which converts the level of the digital signal in the reversed phase a first current amplification part which performs current amplification of the respective signals in the positive phase and the reversed phase obtained by the first and second level conversion circuits a high voltage waveform generation part which generates a high voltage waveform signal necessary for excitation of the ultrasonic vibrator from output from the first current amplification part a second current amplification part which performs current amplification of output of the high voltage waveform generation part to the current necessary for excitation and an adjustment part which adjusts at least one power supply voltage of the first and second level conversion circuits on the basis of the deviation amount of the peaks of the waveforms in the positive phase and the reversed phase obtained by the second current amplification part.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】 目標周波数の送信信号を生成するために求められる従来の耐圧に対し、実質的に半分の耐圧の性能のトランジスタでそれを実現する技術を提供する。【解決手段】 超音波振動子を励振させるための信号の元になる正相のデジタル信号、及び、当該正相のデジタル信号に対して逆相のデジタル信号を発生するデジタル信号発生回路と、正相のデジタル信号のレベルを変換する第1のレベル変換回路と、逆相のデジタル信号のレベルを変換する第2のレベル変換回路と、第1、第2のレベル変換回路よって得られた正相、逆相のそれぞれの信号を電流増幅する第1の電流増幅部と、第1の電流増幅部からの出力から超音波振動子の励振に必要な高電圧波形信号を発生する高電圧波形発生部と、高電圧波形発生部の出力を、励振に必要な電流に電流増幅する第2の電流増幅部と、第2の電流増幅部で
