Patents by Inventor Kogi Sugita

Kogi Sugita 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).

  • High frequency power amplifying apparatus having amplifying stages with gain control signals of lower amplitudes applied to earlier preceding stages
    Patent number: 6658243
    Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is smaller than that applied to an earlier preceding stage.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: December 2, 2003
    Assignees: Hitachi, Ltd., Hitachi Tohbu Semiconductor, Ltd.
    Inventors: Hitoshi Akamine, Nobuhiko Ishihara, Tetsuaki Adachi, Yasuhiro Nunogawa, Kogi Sugita
  • High frequency power amplifying apparatus having amplifying stages with gain control signals of lower amplitudes applied to earlier preceding stages
    Publication number: 20020183029
    Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is smaller than that applied to an earlier preceding stage.
    Type: Application
    Filed: July 22, 2002
    Publication date: December 5, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Hitoshi Akamine, Nobuhiko Ishihara, Tetsuaki Adachi, Yasuhiro Nunogawa, Kogi Sugita
  • High frequency power amplifying apparatus having amplifying stages with gain control signals of lower amplitudes applied to earlier preceding stages
    Patent number: 6463267
    Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is larger than that applied to an earlier preceding stage.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: October 8, 2002
    Assignees: Hitachi, Ltd., Hitachi Tohbu Semiconductor, Ltd.
    Inventors: Hitoshi Akamine, Nobuhiko Ishihara, Tetsuaki Adachi, Yasuhiro Nunogawa, Kogi Sugita