Patents by Inventor Toyohisa Matsukawa

Toyohisa Matsukawa 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).

  • Patent number: 5760725
    Abstract: A current cell type digital-analog (DA) converter is situated in the end portion of a semiconductor chip and adapted to outputting an analog signal having resolution corresponding to the number of bits of an input digital signal. The current cell type DA converter is provided with a decoder for decoding the digital signal and outputting the decoded signal, and a current cell block in which a plurality of current cells corresponding to the resolution of the analog signal are arranged in a row and each of the current cells is controlled by the decoded signal. The centrally-positioned current cell out of those arranged in a row is turned on when the digital signal is odd-numbered and turned off when it is even-numbered. With the centrally-positioned current cell as the central element, current cell pairs disposed on both symmetrical sides of the centrally-positioned current cell are simultaneously turned on or off on a current cell pair basis according to the digital signal.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: June 2, 1998
    Assignee: Kawasaki Steel Corporation
    Inventors: Sinya Yoshida, Toyohisa Matsukawa