Patents by Inventor Shinya Sawamoto

Shinya Sawamoto 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).

  • Power supply dependent optical receiver and amplifier and photocoupler using the same
    Patent number: 8129671
    Abstract: In an optical receiver and amplifier and an optical coupler, a technique for stabilize operations at turning on/off of a power supply by a simple configuration is desired. An optical receiver and amplifier includes: a photodiode generates a photocurrent in response to a light input; an output section outputs output voltage being a low level or a high level in response to a magnitude of the photocurrent by using a power supply voltage supplied from a power supply; and an output control circuit controls an input voltage of the output section such that the output voltage is set to the low level when the power supply is turned on or off during a period where the power supply voltage is lower than a predetermined value. The output voltage can be set to the low level so that an additional circuit for preventing malfunction is not needed.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: March 6, 2012
    Assignee: Renesas Electronics Corporation
    Inventors: Masafumi Shimizu, Shinya Sawamoto
  • OPTICAL RECEIVER AND AMPLIFIER AND PHOTOCOUPLER USING THE SAME
    Publication number: 20090146739
    Abstract: In an optical receiver and amplifier and an optical coupler, a technique for stabilize operations at turning on/off of a power supply by a simple configuration is desired. An optical receiver and amplifier includes: a photodiode generates a photocurrent in response to a light input; an output section outputs output voltage being a low level or a high level in response to a magnitude of the photocurrent by using a power supply voltage supplied from a power supply; and an output control circuit controls an input voltage of the output section such that the output voltage is set to the low level when the power supply is turned on or off during a period where the power supply voltage is lower than a predetermined value. The output voltage can be set to the low level so that an additional circuit for preventing malfunction is not needed.
    Type: Application
    Filed: December 11, 2008
    Publication date: June 11, 2009
    Applicant: NEC Electronics Corporation
    Inventors: Masafumi SHIMIZU, Shinya Sawamoto