Patents by Inventor Shinsuke Nakano

Shinsuke Nakano 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).

  • Publication number: 20240328985
    Abstract: An electrode substrate includes an insulation substrate and a reference electrode on the insulation substrate. The reference electrode includes a silver layer, a first silver chloride layer, and a second silver chloride layer. The silver layer is on the insulation substrate. The first silver chloride layer is on the silver layer on the insulation substrate, and covers the silver layer. The second silver chloride layer is on the first silver chloride layer on the insulation substrate, and covers the first silver chloride layer. An area void fraction of the first silver chloride layer is larger than an area void fraction of the second silver chloride layer in any longitudinal section.
    Type: Application
    Filed: May 30, 2024
    Publication date: October 3, 2024
    Inventors: Naruto MIYAKAWA, Ayumi SHINAGAWA, Tomomi NAKANO, Shota USHIBA, Shinsuke TANI
  • Patent number: 12066735
    Abstract: In a terminator, a midpoint electrode is provided between a first signal electrode and a second signal electrode, a first resistor is connected between the first signal electrode and the midpoint electrode, a second resistor is connected between the second signal electrode and the midpoint electrode, a first GND electrode is provided on a side opposite to the side where the first resistor is provided with the first signal electrode interposed therebetween, a second GND electrode is provided on the side opposite to the side where the second resistor is provided with the second signal electrode interposed therebetween, and capacitances in the terminator are formed between the first signal electrode and the midpoint electrode, between the second signal electrode and the midpoint electrode, between the first signal electrode and the first GND electrode, and between the second signal electrode and the second GND electrode.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: August 20, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shigeru Kanazawa, Hiromasa Tanobe, Josuke Ozaki, Shinsuke Nakano, Nobuhiro Kikuchi
  • Patent number: 12050484
    Abstract: A clock generation circuit includes a mode-locked laser that generates an optical pulse, a photodiode that photoelectrically converts the optical pulse generated by the mode-locked laser, and a filter that attenuates at least one of a DC component and a harmonic component of the mode-locked laser included in an electric signal output from the photodiode.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: July 30, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kenji Tanaka, Naoki Miura, Shinsuke Nakano, Hideyuki Nosaka
  • Patent number: 11462883
    Abstract: A CMOS inverter circuit is provided as a circuit to modulate a current flowing into a laser diode on the basis of a digital signal. An amplitude of a current flowing in a PMOSFET in the CMOS inverter circuit is made to contribute to an amplitude of the current flowing into the laser diode, to reduce an input amplitude.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: October 4, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toshiki Kishi, Munehiko Nagatani, Shinsuke Nakano, Hideyuki Nosaka
  • Patent number: 11372307
    Abstract: Provided is an optical modulator having an optical modulation high frequency line through which a high frequency electrical signal can be efficiently input to an optical modulation region and which is in a broadband. High frequency lines of an optical modulator, that is, an input high frequency line, an optical modulation high frequency line, and an output high frequency line have a line configuration in which each of the input high frequency line and the output high frequency line is divided into a plurality of segments, and adjacent segments of the plurality of the segments have different characteristic impedances and propagation constants. The input high frequency line and the output high frequency line may be implemented by changing a width or a thickness of a signal electrode formed on a dielectric forming a micro-strip line between adjacent segments.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: June 28, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Nobuhiro Kikuchi, Eiichi Yamada, Josuke Ozaki, Yoshihiro Ogiso, Yuta Ueda, Shinsuke Nakano
  • Patent number: 11323084
    Abstract: A linear amplifier includes a pre-amplifier configured to amplify an input differential signal, a post-amplifier configured to amplify an output signal of the pre-amplifier, an amplitude detector configured to detect an amplitude of an output signal of the post-amplifier, and an output voltage corresponding to the detected amplitude, a comparator configured to control a tail current source of the pre-amplifier such that when the output voltage of the amplitude detector is less than or equal to a reference voltage, a tail current of the pre-amplifier is set to a constant value, and when the output voltage of the amplitude detector is larger than the reference voltage, the tail current is reduced to make the output voltage of the amplitude detector equal to the reference voltage.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: May 3, 2022
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Teruo Jo, Shinsuke Nakano, Munehiko Nagatani
  • Patent number: 11233393
    Abstract: A reception-side IC chip (1a) includes a pad (15) which is connected to a transmission line (2) which is outside the chip and has a characteristic impedance Z0 of 50?, a signal line (16), one end of which is connected to the pad (15), a reception-side input unit circuit (10) configured to receive a signal (S) transmitted from a transmission-side IC chip via the transmission line (2), a 50-? termination resistor (11), for impedance matching, which is connected between a predetermined voltage and the other end of the signal line (16) and is configured to terminate the transmission line (2), and a capacitor (12) inserted between a node (A) of the signal line (16) and the termination resistor (11) and an input terminal (In) of the reception-side input unit circuit (10). A DC-blocking circuit is formed by the capacitor (12).
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: January 25, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Munehiko Nagatani, Hideyuki Nosaka, Shinsuke Nakano
  • Publication number: 20210359655
    Abstract: A linear amplifier includes a pre-amplifier configured to amplify an input differential signal, a post-amplifier configured to amplify an output signal of the pre-amplifier, an amplitude detector configured to detect an amplitude of an output signal of the post-amplifier, and an output voltage corresponding to the detected amplitude, a comparator configured to control a tail current source of the pre-amplifier such that when the output voltage of the amplitude detector is less than or equal to a reference voltage, a tail current of the pre-amplifier is set to a constant value, and when the output voltage of the amplitude detector is larger than the reference voltage, the tail current is reduced to make the output voltage of the amplitude detector equal to the reference voltage.
    Type: Application
    Filed: October 16, 2019
    Publication date: November 18, 2021
    Inventors: Teruo Jo, Shinsuke Nakano, Munehiko Nagatani
  • Publication number: 20210341812
    Abstract: In a terminator, a midpoint electrode is provided between a first signal electrode and a second signal electrode, a first resistor is connected between the first signal electrode and the midpoint electrode, a second resistor is connected between the second signal electrode and the midpoint electrode, a first GND electrode is provided on a side opposite to the side where the first resistor is provided with the first signal electrode interposed therebetween, a second GND electrode is provided on the side opposite to the side where the second resistor is provided with the second signal electrode interposed therebetween, and capacitances in the terminator are formed between the first signal electrode and the midpoint electrode, between the second signal electrode and the midpoint electrode, between the first signal electrode and the first GND electrode, and between the second signal electrode and the second GND electrode.
    Type: Application
    Filed: September 11, 2019
    Publication date: November 4, 2021
    Inventors: Shigeru Kanazawa, Hiromasa Tanobe, Josuke Ozaki, Shinsuke Nakano, Nobuhiro Kikuchi
  • Publication number: 20210216097
    Abstract: A clock generation circuit includes a mode-locked laser that generates an optical pulse, a photodiode that photoelectrically converts the optical pulse generated by the mode-locked laser, and a filter that attenuates at least one of a DC component and a harmonic component of the mode-locked laser included in an electric signal output from the photodiode.
    Type: Application
    Filed: April 17, 2019
    Publication date: July 15, 2021
    Inventors: Kenji Tanaka, Naoki Miura, Shinsuke Nakano, Hideyuki Nosaka
  • Publication number: 20210175706
    Abstract: A reception-side IC chip (1a) includes a pad (15) which is connected to a transmission line (2) which is outside the chip and has a characteristic impedance Z0 of 50 ?, a signal line (16), one end of which is connected to the pad (15), a reception-side input unit circuit (10) configured to receive a signal (S) transmitted from a transmission-side IC chip via the transmission line (2), a 50-? termination resistor (11), for impedance matching, which is connected between a predetermined voltage and the other end of the signal line (16) and is configured to terminate the transmission line (2), and a capacitor (12) inserted between a node (A) of the signal line (16) and the termination resistor (11) and an input terminal (In) of the reception-side input unit circuit (10). A DC-blocking circuit is formed by the capacitor (12).
    Type: Application
    Filed: December 13, 2018
    Publication date: June 10, 2021
    Inventors: Munehiko NAGATANI, Hideyuki NOSAKA, Shinsuke NAKANO
  • Publication number: 20210091533
    Abstract: A CMOS inverter circuit is provided as a circuit to modulate a current flowing into a laser diode on the basis of a digital signal. An amplitude of a current flowing in a PMOSFET in the CMOS inverter circuit is made to contribute to an amplitude of the current flowing into the laser diode, to reduce an input amplitude.
    Type: Application
    Filed: February 22, 2019
    Publication date: March 25, 2021
    Inventors: Toshiki Kishi, Munehiko Nagatani, Shinsuke Nakano, Hideyuki Nosaka
  • Publication number: 20210080795
    Abstract: Provided is an optical modulator having an optical modulation high frequency line through which a high frequency electrical signal can be efficiently input to an optical modulation region and which is in a broadband. High frequency lines of an optical modulator, that is, an input high frequency line, an optical modulation high frequency line, and an output high frequency line have a line configuration in which each of the input high frequency line and the output high frequency line is divided into a plurality of segments, and adjacent segments of the plurality of the segments have different characteristic impedances and propagation constants. The input high frequency line and the output high frequency line may be implemented by changing a width or a thickness of a signal electrode formed on a dielectric forming a micro-strip line between adjacent segments.
    Type: Application
    Filed: March 6, 2019
    Publication date: March 18, 2021
    Inventors: Nobuhiro Kikuchi, Eiichi Yamada, Josuke Ozaki, Yoshihiro Ogiso, Yuta Ueda, Shinsuke Nakano
  • Patent number: 10950293
    Abstract: A signal processing circuit is provided that generates output signals to be output from spatially different output ports based on bit combinations of an input word consisting of a plurality of bit signals. A distributed memory, a ROM and a DAC in which the signal processing circuit is used are also provided. A recognition circuit includes a serial port to which a bit signal is input and 2N output ports recognizing an input N-bit word and corresponding uniquely to 2N bit combinations. Output ports of the recognition circuit are connected to 2N input ports of an electric circuit. With no signal input to the recognition circuit, all outputs are constantly in a Low level state. In a case where a bit signal is input to the serial port of the recognition circuit, only one of the output ports corresponding to the bit combinations turns to a High level state.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: March 16, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Salaheldin Ahmed Ezzeldin Ibrahim Mohamed, Youhei Sakamaki, Shinsuke Nakano, Kota Shikama, Yuko Kawajiri
  • Patent number: 10892716
    Abstract: An amplifier applied to TIA is provided to suppress the noise caused by a current source. An amplifier constituting a transimpedance amplifier includes an inductor element inserted between a current source connected to an input terminal of an amplification stage and a power source voltage line. The current source includes a first transistor in which a base terminal is connected to a current control bias and a collector terminal is connected to the input terminal. The inductor element is inserted between the emitter terminal of the first transistor and the power source voltage line.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: January 12, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shinsuke Nakano, Hiroaki Katsurai, Masafumi Nogawa, Shunji Kimura, Masatoshi Tobayashi, Shigehiro Kurita, Masahiro Endo
  • Patent number: 10804857
    Abstract: An amplifier typically exemplified by a TIA is realized that provides an optimal band characteristic, that reduces the possibility of the oscillation, and that achieves a reduced dispersion of the band characteristics. An amplifier for amplifying an electric signal, comprising: a first buffer for amplifying the electric signal; a filter that is connected to an output of the first buffer and that includes a parallel circuit consisting of an inductor and a first capacity; and a second buffer connected to an output of the filter.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: October 13, 2020
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NTT ELECTRONICS CORPORATION
    Inventors: Masafumi Nogawa, Shinsuke Nakano, Hiroaki Sanjoh, Masatoshi Tobayashi, Yoshikazu Urabe, Masahiro Endo
  • Patent number: 10666212
    Abstract: A positive-side power supply terminal (1-1a) of a differential amplifier (1-1) is connected to a positive-side power supply line (L1). A negative-side power supply terminal (1-2b) of a differential amplifier (1-2) is connected to a negative-side power supply line (L2). A negative-side power supply terminal (1-1b) of the differential amplifier (1-1) and a positive-side power supply terminal (1-2a) of the differential amplifier (1-2) are connected to each other. A final-stage amplifier (2) is connected between the positive-side power supply line (L1) and the negative-side power supply line (L2).
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: May 26, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shinsuke Nakano, Masafumi Nogawa, Hideyuki Nosaka
  • Publication number: 20200135256
    Abstract: A signal processing circuit is provided that generates output signals to be output from spatially different output ports based on bit combinations of an input word consisting of a plurality of bit signals. A distributed memory, a ROM and a DAC in which the signal processing circuit is used are also provided. A recognition circuit includes a serial port to which a bit signal is input and 2N output ports recognizing an input N-bit word and corresponding uniquely to 2N bit combinations. Output ports of the recognition circuit are connected to 2N input ports of an electric circuit. With no signal input to the recognition circuit, all outputs are constantly in a Low level state. In a case where a bit signal is input to the serial port of the recognition circuit, only one of the output ports corresponding to the bit combinations turns to a High level state.
    Type: Application
    Filed: April 19, 2018
    Publication date: April 30, 2020
    Inventors: Salaheldin Ahmed Ezzeldin Ibrahim Mohamed, Youhei Sakamaki, Shinsuke Nakano, Kota Shikama, Yuko Kawajiri
  • Patent number: 10637207
    Abstract: A driver circuit 11 includes a plurality of cascode-connected NMOS transistors, a modulating signal VGN1 is applied to a gate terminal of a lowermost stage transistor TN1 located at a lowermost stage out of the NMOS transistors, and an upper stage bias potential VGN2 that is a sum of a minimum gate-source voltage VGN1min and a maximum drain-source voltage VDS1max of a transistor (TN1) located immediately below an upper stage transistor located at an upper stage above the lowermost stage transistor of the NMOS transistors is applied to the upper stage transistor TN2.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: April 28, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toshiki Kishi, Munehiko Nagatani, Shinsuke Nakano, Hiroaki Katsurai, Masafumi Nogawa, Hideyuki Nosaka
  • Publication number: 20200036344
    Abstract: An amplifier applied to TIA is provided to suppress the noise caused by a current source. An amplifier constituting a transimpedance amplifier includes an inductor element inserted between a current source connected to an input terminal of an amplification stage and a power source voltage line. The current source includes a first transistor in which a base terminal is connected to a current control bias and a collector terminal is connected to the input terminal. The inductor element is inserted between the emitter terminal of the first transistor and the power source voltage line.
    Type: Application
    Filed: July 1, 2016
    Publication date: January 30, 2020
    Inventors: Shinsuke Nakano, Hiroaki Katsurai, Masafumi Nogawa, Shunji Kimura, Masatoshi Tobayashi, Shigehiro Kurita, Masahiro Endo