Ultrasonic diagnostic device

An ultrasonic diagnostic device, comprising:

• an ultrasonic probe configured to transmit ultrasonic waves to a subject and convert reflection waves reflected by the subject to a reflection wave signal;
• transformer circuitry including an auto transformer configured to transform the reflection wave signal into a transformed reflection wave signal at a transformation ratio, which is determined in accordance with a control signal determined based on information related to the ultrasonic probe among a plurality of transformation ratios;
• control signal transmission circuitry configured to transmit, to the transformer circuitry, the control signal, which is determined in accordance with a frequency which the ultrasonic probe is capable of handling;
• and
• a switch provided at an input of the transformer circuitry, the switch being configured to switch whether the reflection wave signal is boosted by the transformer circuitry.