Patents by Inventor Hiromi Tukada

Hiromi Tukada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Semiconductor circuit with low power consumption having emitter-coupled logic or differential amplifier
    Patent number: 4999519
    Abstract: An ECL circuit wherein a current switch and an emitter follower are coupled, is so constructed that, in a standby mode, the current switch has its current cut off or rendered smaller than in an operating mode. In addition, the ECL circuit comprises means for decoupling a load resistance of the current switch and a base of the emitter follower in the case of cutting off the current of the current switch, or means for increasing the load resistance of the current switch in the case of rendering the current of the current switch smaller. The semiconductor circuit of the present invention can reduce the power consumption of the ECL circuit and can suppress fluctuations in the voltage levels of the outputs of the ECL circuit.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: March 12, 1991
    Assignees: Hitachi VLSI Engineering Corporation, Hitachi Ltd.
    Inventors: Goro Kitsukawa, Kazumasa Yanagisawa, Takayuki Kawahara, Ryoichi Hori, Yoshinobu Nakagome, Noriyuki Hamma, Kiyoo Itoh, Hiromi Tukada