PROBLEM TO BE SOLVED: To provide a transmission circuit of an ultrasonic transducer capable of generating a high-voltage short-wave transmission signal by simple control, and an ultrasonic probe and an ultrasonic diagnostic apparatus.SOLUTION: A positive-electrode drive circuit 2a drives, during an ON period of a switch 13a, a drive input terminal 7 of an ultrasonic transducer 4 toward positive-electrode power supply HVDD by a drive current on the basis of a variable current source 10a. A negative-electrode drive circuit 2b drives, during the ON period of the switch 13b, the drive input terminal 7 toward negative-electrode power supply HVSS by a drive current on the basis of a variable current source 10b. A reference drive circuit 3 drives the drive input terminal 7 toward reference power supply GND.SELECTED DRAWING: Figure 1【課題】簡素な制御で高電圧単波送信信号を生成可能な超音波振動子の送信回路、超音波プローブ、および超音波診断装置を提供する。【解決手段】正極用駆動回路2aは、スイッチ13aのオン期間で、超音波振動子4の駆動入力端子7を可変電流源10aに基づく駆動電流によって正極電源HVDDに向けて駆動する。負極用駆動回路2bは、スイッチ13bのオン期間で、駆動入力端子7を可変電流源10bに基づく駆動電流によって負極電源HVSSに向けて駆動する。基準用駆動回路3は、駆動入力端子7を、基準電源GNDに向けて駆動する。【選択図】図1
