Patent ID: 11844653

Abstract:
To provide a probe including a TGC circuit therein. The probe includes a plurality of receive circuits. Each receive circuit includes: an ultrasound transducer; a transmit/receive switch; a variable attenuator; a first capacitor; and an amplifier. The ultrasound transducer converts the receive signal into a ground level electric signal and outputs the ground level electric signal as a first output signal. The transmit/receive switch is connected to a first signal line, and switches depending on whether to output the first output signal output from the ultrasound transducer to the first signal line. The variable attenuator includes a control terminal and two terminals, and changes a resistance value between the two terminals other than the control terminal based on a control signal input to the control terminal. The amplifier has an input terminal connected to the first capacitor and includes at least an amplifier circuit configured to amplify an electric signal of the first signal line and output the amplified electric signal to a second signal line. In the variable attenuator, one of the two terminals other than the control terminal is connected to the first signal line, and the other terminal is connected to the ground via a second capacitor different from the first capacitor.