Patents by Inventor Seiji Sekimoto

Seiji Sekimoto 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).

  • Analog multistage amplification circuit in the field of sensor
    Patent number: 7342454
    Abstract: An analog multistage amplification circuit for keeping the total gain of analog amplifiers constant while automatically controlling gain of the amplifiers in accordance with an input signal level and improving the S/N ratio of the output signal. The amplification circuit includes an input stage amplifier, an output stage amplifier, a filter connected between the input and output stage amplifiers, an auto gain control circuit for generating a control signal for controlling the gain of the input stage amplifier based on the output signal of the input stage amplifier so that the output signal has a maximum level, and a first gain adjustment circuit for generating an adjustment signal for adjusting the gain of the output stage amplifier so that the total gain of the input and output stage amplifiers is kept constant in accordance with the control signal of the auto gain control circuit.
    Type: Grant
    Filed: April 11, 2006
    Date of Patent: March 11, 2008
    Assignee: Fujitsu Limited
    Inventors: Seiji Sekimoto, Kazunori Nishizono
  • Analog multistage amplification circuit in the field of sensor
    Publication number: 20070146075
    Abstract: An analog multistage amplification circuit for keeping the total gain of analog amplifiers constant while automatically controlling gain of the amplifiers in accordance with an input signal level and improving the S/N ratio of the output signal. The amplification circuit includes an input stage amplifier, an output stage amplifier, a filter connected between the input and output stage amplifiers, an auto gain control circuit for generating a control signal for controlling the gain of the input stage amplifier based on the output signal of the input stage amplifier so that the output signal has a maximum level, and a first gain adjustment circuit for generating an adjustment signal for adjusting the gain of the output stage amplifier so that the total gain of the input and output stage amplifiers is kept constant in accordance with the control signal of the auto gain control circuit.
    Type: Application
    Filed: April 11, 2006
    Publication date: June 28, 2007
    Inventors: Seiji Sekimoto, Kazunori Nishizono