Patents by Inventor Chisato Maeda

Chisato Maeda 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).

  • Switch circuit, filter circuit and test apparatus
    Patent number: 8232808
    Abstract: There is provided a switch circuit for switching whether to output an input signal, including: a transmission path that transmits the input signal from an input end to an output end of the switch circuit; a first semiconductor switch that is provided on the transmission path and switches whether to transmit the input signal; a second semiconductor switch that is opened when the first semiconductor switch is short-circuited, and that is short-circuited when the first semiconductor switch is opened, thereby grounding, to a ground potential, a high-frequency signal leaked to the transmission path between the first semiconductor switch and the output end; and a voltage controller that causes a potential difference on both ends of the second semiconductor switch when the second semiconductor switch is opened.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: July 31, 2012
    Assignee: Advantest Corporation
    Inventors: Hiroki Kimura, Chisato Maeda
  • SWITCH CIRCUIT, FILTER CIRCUIT AND TEST APPARATUS
    Publication number: 20090230978
    Abstract: There is provided a switch circuit for switching whether to output an input signal, including: a transmission path that transmits the input signal from an input end to an output end of the switch circuit; a first semiconductor switch that is provided on the transmission path and switches whether to transmit the input signal; a second semiconductor switch that is opened when the first semiconductor switch is short-circuited, and that is short-circuited when the first semiconductor switch is opened, thereby grounding, to a ground potential, a high-frequency signal leaked to the transmission path between the first semiconductor switch and the output end; and a voltage controller that causes a potential difference on both ends of the second semiconductor switch when the second semiconductor switch is opened.
    Type: Application
    Filed: September 10, 2008
    Publication date: September 17, 2009
    Applicant: ADVANTEST CORPORATION
    Inventors: HIROKI KIMURA, CHISATO MAEDA