Patents by Inventor Tsuyoshi Kawata

Tsuyoshi Kawata 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: 7030802
    Abstract: An AD converter having a series resistor arranged to generate at each of connection points a reference voltage to convert an analog value to a digital value, and semiconductor switches each constituted by a parallel combination of a PMOSFET and an NMOSFET and disposed one for each of the connection points, the AD converter, while applying a first voltage to a first gate electrode of the PMOSFET to bring the PMOSFET into conduction and a second voltage higher than the first voltage to a second gate electrode of the NMOSFET to bring the NMOSFET into conduction, generating the digital value on the basis of results of comparing the analog value with the reference voltages output from the semiconductor switches, comprises a control circuit operable at least either to step down the first voltage applied to the first gate electrode or to step up the second voltage applied to the second gate electrode.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: April 18, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Tsuyoshi Kawata
  • Publication number: 20050099329
    Abstract: An AD converter having a series resistor arranged to generate at each of connection points a reference voltage to convert an analog value to a digital value, and semiconductor switches each constituted by a parallel combination of a PMOSFET and an NMOSFET and disposed one for each of the connection points, the AD converter, while applying a first voltage to a first gate electrode of the PMOSFET to bring the PMOSFET into conduction and a second voltage higher than the first voltage to a second gate electrode of the NMOSFET to bring the NMOSFET into conduction, generating the digital value on the basis of results of comparing the analog value with the reference voltages output from the semiconductor switches, comprises a control circuit operable at least either to step down the first voltage applied to the first gate electrode or to step up the second voltage applied to the second gate electrode.
    Type: Application
    Filed: November 5, 2004
    Publication date: May 12, 2005
    Applicant: Sanyo Electric Co., Ltd.
    Inventor: Tsuyoshi Kawata