| 摘要 |
PROBLEM TO BE SOLVED: To prevent the sneak path of transmission signals to a reception circuit in an ultrasonic diagnostic apparatus. SOLUTION: To a diode bridge circuit 14, a bias control circuit is connected. By the bias control circuit, the supply of a bias current is stopped at the time of the transmission. Thus, the sneak path of the transmission signals is interrupted. On the other hand, at the time of reception, the bias current is made to flow and thus, weak reception signals are supplied to a reception signal processing circuit. |
