| 摘要 |
An ultrasonic sensor (1) includes a signal generation circuit (11), an amplifier (12), and a matching circuit (13) as a transmission-side circuit. The signal generation circuit (11) includes a driving signal generation circuit (111) that generates a driving signal for transmitting ultrasonic waves from an ultrasonic transducer (10) for transmission and reception and a reverberation suppression signal generation circuit (112) that generates a reverberation suppression signal for suppressing reverberation occurring at the ultrasonic transducer (10) from which the ultrasonic waves are transmitted. The reverberation suppression signal generation circuit (111) generates the reverberation suppression signal having a frequency of 1/2 times the frequency of the driving signal and applies the reverberation suppression signal to the ultrasonic transducer (10) at a time delayed from the driving signal by a half wavelength. With the above configuration, an ultrasonic sensor driving circuit capable of reducing the duration of the reverberation occurring at the ultrasonic transducer is provided. |
