Hitachi, Ltd.

Ablic Inc.

Na Li

Hiroyasu Yoshizawa

Yoshihiro Hayashi

Satoshi Hanazawa

Shunsuke Kubota

Tatsuya Odawara

A transmission circuit for ultrasonic diagnosis includes a delay processing circuit that delays a transmission signal pattern and an operational circuit that calculates a delay time. A transmission timing for supplying the transmission signal pattern to a plurality of piezo electric elements corresponding to a plurality of channels is approximated by a multi-dimensional polynomial with locations of the plurality of piezo electric elements being variables so that the transmission timing becomes linear or arc-like. Coefficients in the multi-dimensional polynomial are supplied to the transmission circuit for ultrasonic diagnosis. The delay time in the delay processing circuit is determined by a first coefficient. The operational circuit calculates the delay time based on a second coefficient. The transmission signal pattern is supplied to the plurality of piezo electric elements at a transmission timing including the delay time according to the first coefficient and the delay time according to the second coefficient.

Transmission circuit for ultrasonic diagnosis and method for transmitting ultrasonic wave

A semiconductor integrated circuit device that has a high-voltage analog switch circuit and is operable at a low power-supply voltage, and which has a first high-voltage MOSFET HN, a second high-voltage MOSFET, and a first floating gate voltage control circuit. The first floating gate voltage control circuit operates at a voltage of 5 V or lower, and when turning on the first high-voltage MOSFET and the second high-voltage MOSFET, the first floating gate voltage control circuit sets a voltage in the source terminal of the first high-voltage MOSFET as a reference voltage, adds a floating voltage corresponding to the power-supply voltage to the reference voltage, and supplies the added voltage to the gate terminals of the first high-voltage MOSFET and the second high-voltage MOSFET.

Semiconductor integrated circuit device

Provided is a switching circuit capable of transmitting a signal with large amplitude and large current while suppressing deterioration when a small-amplitude signal is transmitted. The switching circuitincludes a first terminal a, a second terminal b, a first switch, a second switch, a first separation switch, and a second separation switch. The first switchconnects the first terminal a and the second terminal b according to a control signal. The second switchhas a first node nand a second node n, and connects between the nodes in synchronization with the first switch. The first separation switchtransmits a signal of the first node nto the second node nwhen an electric potential of the first node nis higher than that of the second node nby more than a predetermined electric potential. The second separation switchtransmits a signal of the first node nto the second terminal b when an electric potential of the first node nis higher than an electric potential of the second node nby more than a predetermined electric potential.

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Tokyo, Japan

Na Li