Patents by Inventor Saburo Hojo

Saburo Hojo 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).

  • Mixed mode simulation method and simulator
    Patent number: 5481484
    Abstract: A mixed mode simulation method and apparatus are provided for highly accurately simulating the total characteristics of a digital analyzed circuit portion and an analog analyzed circuit portion, which are both subjected to mixed mode simulation, in consideration of the influence exerted on the analog analyzed circuit portion by a current consumed by the digital analyzed circuit portion. More particularly, a current value of an equivalent circuit for current calculation modeled for providing the analog analyzed circuit portion with a current generated due to an operating state of the digital analyzed circuit portion realized by logic simulation is determined in synchronism with the logic simulation, and the equivalent circuit for current calculation derived thereby is composed with the analog analyzed circuit portion, and this composite circuit is subjected to circuit simulation.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: January 2, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Munehiro Ogawa, deceased, Masato Iwabuchi, Hitoshi Sugihara, Saburo Hojo, Masami Kinoshita, Osamu Yamashiro, Goichi Yokomizo, Mikako Miyama