Patents by Inventor Taku HIRAMATSU

Taku HIRAMATSU 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).

  • Signal output circuit, transmission circuit and integrated circuit
    Patent number: 11177985
    Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.
    Type: Grant
    Filed: December 7, 2020
    Date of Patent: November 16, 2021
    Assignee: SOCIONEXT INC.
    Inventors: Taku Hiramatsu, Shigeaki Kawai
  • SIGNAL OUTPUT CIRCUIT, TRANSMISSION CIRCUIT AND INTEGRATED CIRCUIT
    Publication number: 20210091981
    Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.
    Type: Application
    Filed: December 7, 2020
    Publication date: March 25, 2021
    Inventors: Taku HIRAMATSU, Shigeaki Kawai
  • Signal output circuit, transmission circuit and integrated circuit
    Patent number: 10892923
    Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: January 12, 2021
    Assignee: SOCIONEXT INC.
    Inventors: Taku Hiramatsu, Shigeaki Kawai
  • SIGNAL OUTPUT CIRCUIT, TRANSMISSION CIRCUIT AND INTEGRATED CIRCUIT
    Publication number: 20190245721
    Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.
    Type: Application
    Filed: January 23, 2019
    Publication date: August 8, 2019
    Inventors: Taku HIRAMATSU, Shigeaki Kawai