Patents by Inventor Yasuhiro Takai

Yasuhiro Takai 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).

  • Patent number: 11251796
    Abstract: A phase-locked loop (PLL) circuit is configured to adjust a value of a bias voltage based on a comparison between a reference clock signal and a feedback clock signal, and an oscillator circuit is configured to provide the feedback clock signal and phase-shifted clock signals based on a value of the bias voltage. A frequency detector of the frequency detector is configured to cause an adjustment to the value of the bias voltage in response to detection of a frequency deviation between the reference clock signal and the feedback clock signal. To avoid a metastable state, the frequency detector is configured to apply an asynchronous delay to one of the reference clock signal or the feedback clock signal prior to detection of the frequency deviation.
    Type: Grant
    Filed: November 16, 2020
    Date of Patent: February 15, 2022
    Assignee: Micron Technology, Inc.
    Inventors: Yasuhiro Takai, Maksim Kuzmenka, Mani Balakrishnan, Martin Brox
  • Publication number: 20210075428
    Abstract: A phase-locked loop (PLL) circuit is configured to adjust a value of a bias voltage based on a comparison between a reference clock signal and a feedback clock signal, and an oscillator circuit is configured to provide the feedback clock signal and phase-shifted clock signals based on a value of the bias voltage. A frequency detector of the frequency detector is configured to cause an adjustment to the value of the bias voltage in response to detection of a frequency deviation between the reference clock signal and the feedback clock signal, To avoid a metastable state, the frequency detector is configured to apply an asynchronous delay to one of the reference clock signal or the feedback clock signal prior to detection of the frequency deviation.
    Type: Application
    Filed: November 16, 2020
    Publication date: March 11, 2021
    Applicant: MICRON TECHNOLOGY, INC.
    Inventors: Yasuhiro Takai, Maksim Kuzmenka, Mani Balakrishnan, Martin Brox
  • Publication number: 20210058090
    Abstract: Disclosed herein is an apparatus that includes a phase frequency detector configured to compare a phase difference between first and second clock signals to generate a phase detection signal, and a slew rate controller configured to lower a slew rate of the first clock signal when a selection signal is in a first state.
    Type: Application
    Filed: August 22, 2019
    Publication date: February 25, 2021
    Applicant: Micron Technology, Inc.
    Inventors: Yasuhiro Takai, Martin Brox, Mani Balakrishnan, Maksim Kuzmenka
  • Patent number: 10931287
    Abstract: Disclosed herein is an apparatus that includes a phase frequency detector configured to compare a phase difference between first and second clock signals to generate a phase detection signal, and a slew rate controller configured to lower a slew rate of the first clock signal when a selection signal is in a first state.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: February 23, 2021
    Assignee: Micron Technology, Inc.
    Inventors: Yasuhiro Takai, Martin Brox, Mani Balakrishnan, Maksim Kuzmenka
  • Patent number: 10872643
    Abstract: An apparatus may include a first pad and a first input circuit coupled to the first pad. The first input circuitry may include a first signal propagation path that couples to the first pad, a latch circuit, a second signal propagation path that couples to the latch circuit, and a gate circuitry coupling between the first and second signal propagation paths. The first signal propagation path may have first signal propagation time and the second signal propagation path may have second signal propagation time that is greater than the first propagation time.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: December 22, 2020
    Assignee: Micron Technology, Inc.
    Inventors: Yutaka Uemura, Yasuhiro Takai
  • Patent number: 10840918
    Abstract: A phase-locked loop (PLL) circuit is configured to adjust a value of a bias voltage based on a comparison between a reference clock signal and a feedback clock signal, and an oscillator circuit is configured to provide the feedback clock signal and phase-shifted clock signals based on a value of the bias voltage. A frequency detector of the frequency detector is configured to cause an adjustment to the value of the bias voltage in response to detection of a frequency deviation between the reference clock signal and the feedback clock signal. To avoid a metastable state, the frequency detector is configured to apply an asynchronous delay to one of the reference clock signal or the feedback clock signal prior to detection of the frequency deviation.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: November 17, 2020
    Assignee: Micron Technology, Inc.
    Inventors: Yasuhiro Takai, Maksim Kuzmenka, Mani Balakrishnan, Martin Brox
  • Publication number: 20200313678
    Abstract: A phase-locked loop (PLL) circuit is configured to adjust a value of a bias voltage based on a comparison between a reference clock signal and a feedback clock signal, and an oscillator circuit is configured to provide the feedback clock signal and phase-shifted clock signals based on a value of the bias voltage. A frequency detector of the frequency detector is configured to cause an adjustment to the value of the bias voltage in response to detection of a frequency deviation between the reference clock signal and the feedback clock signal. To avoid a metastable state, the frequency detector is configured to apply an asynchronous delay to one of the reference clock signal or the feedback clock signal prior to detection of the frequency deviation.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 1, 2020
    Applicant: MICRON TECHNOLOGY, INC.
    Inventors: Yasuhiro Takai, Maksim Kuzmenka, Mani Balakrishnan, Martin Brox
  • Publication number: 20190371374
    Abstract: An apparatus may include a first pad and a first input circuit coupled to the first pad. The first input circuitry may include a first signal propagation path that couples to the first pad, a latch circuit, a second signal propagation path that couples to the latch circuit, and a gate circuitry coupling between the first and second signal propagation paths. The first signal propagation path may have first signal propagation time and the second signal propagation path may have second signal propagation time that is greater than the first propagation time.
    Type: Application
    Filed: July 22, 2019
    Publication date: December 5, 2019
    Inventors: Yutaka Uemura, Yasuhiro Takai
  • Patent number: 10403335
    Abstract: An apparatus may include a first pad and a first input circuit coupled to the first pad. The first input circuitry may include a first signal propagation path that couples to the first pad, a latch circuit, a second signal propagation path that couples to the latch circuit, and a gate circuitry coupling between the first and second signal propagation paths. The first signal propagation path may have first signal propagation time and the second signal propagation path may have second signal propagation time that is greater than the first propagation time.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: September 3, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Yutaka Uemura, Yasuhiro Takai
  • Publication number: 20170148495
    Abstract: Apparatuses for receiving an input signal in a semiconductor device are described. An example apparatus includes an input node; a reference node supplied with a reference voltage; first, second, third and fourth nodes; a first transistor coupled between the first node and the second node, the first transistor having a gate coupled to the input node; a second transistor coupled between the first node and the third node, the second transistor having a gate coupled to the reference node; a third transistor coupled between the second node and the fourth node, the third transistor having a gate coupled to the third node; a fourth transistor coupled between the third node and the fourth node, the fourth transistor having a gate coupled to the third node; and a capacitor coupled between the input node and the third node.
    Type: Application
    Filed: November 20, 2015
    Publication date: May 25, 2017
    Inventor: Yasuhiro Takai
  • Patent number: 9570375
    Abstract: Disclosed herein is a device that includes a silicon interposer having wiring lines on first and second wiring layers. The wiring lines includes first, second and third wiring lines provided on the first wiring layer and a fourth wiring line provided on the second wiring layer. The third wiring line is arranged between the first and second wiring lines on the first wiring layer. The fourth wiring line is overlapped with the third wiring line. Each of the first, second and fourth wiring lines conveys a power supply potential to first and second semiconductor chips mounted on the silicon interposer, and the third wiring line conveys a first signal communicated between the first and second semiconductor chips.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: February 14, 2017
    Assignee: Longitude Semiconductor S.a.r.l.
    Inventors: Atsushi Hiraishi, Toshio Sugano, Yasuhiro Takai
  • Publication number: 20160277028
    Abstract: [Problem] To provide an input receiver making it possible to obtain adequate gain with respect to a broad reference potential level. [Solution] The present invention is provided with a differential circuit (110) and a current-supplying circuit (120). The differential circuit (110) includes a first input terminal to which a reference potential VREF is fed, and a second input terminal to which an input signal DQ is fed, the differential circuit (110) generating an output signal based on the difference in potential between the reference potential VREF and the input signal DQ. The current-supplying circuit (120) feeds an actuating current to the differential circuit (110). The actuating current includes the sum of first and second actuating currents. The current-supplying circuit (120) includes a common-mode feedback circuit (CMFB) and an assist circuit (TA). The common-mode feedback circuit (CMFB) changes the first actuating current in accordance with the level of the reference potential VREF.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 22, 2016
    Inventor: Yasuhiro Takai
  • Patent number: 9431094
    Abstract: Apparatuses including a data input circuit of a semiconductor device are described. An example apparatus includes a first transistor that receives a reference voltage, a second transistor that receives an input signal, cross-couple type transistors, diode-connect type transistors and resistors. The cross-couple type resistors include a third transistor having a gate coupled to a drain of the second transistor, and a fourth transistor having a gate coupled to a drain of the first transistor. The diode-connect type transistors include a fifth transistor having a drain coupled to a drain of the third transistor, and a sixth transistor having a drain coupled to a drain of the fourth transistor. The resistors include a first resistor coupled between a gate and the drain of the fifth transistor and a second resistor coupled between a gate and the drain of the sixth transistor.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: August 30, 2016
    Assignee: Micron Technology, Inc.
    Inventor: Yasuhiro Takai
  • Patent number: 9384819
    Abstract: Disclosed herein is a device including a timing control circuit that receives a strobe signal supplied from outside to generate an internal strobe signal that is used as a timing signal to latch a data signal. An operation state of the timing control circuit is changed according to temperature change so as to keep an output timing of the internal strobe signal with respect to an input timing of the strobe signal.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: July 5, 2016
    Assignee: PS4 Luxco S.a.r.l.
    Inventor: Yasuhiro Takai
  • Publication number: 20150262647
    Abstract: Disclosed herein is a device including a timing control circuit that receives a strobe signal supplied from outside to generate an internal strobe signal that is used as a timing signal to latch a data signal. An operation state of the timing control circuit is changed according to temperature change so as to keep an output timing of the internal strobe signal with respect to an input timing of the strobe signal.
    Type: Application
    Filed: June 1, 2015
    Publication date: September 17, 2015
    Applicant: PS4 Luxco S.a.r.l.
    Inventor: Yasuhiro Takai
  • Patent number: 9047927
    Abstract: Disclosed herein is a device including a timing control circuit that receives a strobe signal supplied from outside to generate an internal strobe signal that is used as a timing signal to latch a data signal. An operation state of the timing control circuit is changed according to temperature change so as to keep an output timing of the internal strobe signal with respect to an input timing of the strobe signal.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: June 2, 2015
    Assignee: PS4 LUXCO S.A.R.L.
    Inventor: Yasuhiro Takai
  • Patent number: 8988952
    Abstract: Disclosed herein is a device that includes: a data strobe terminal; a data terminal; a first output driver coupled to the data strobe terminal; a second output driver coupled to the data terminal; and a data control circuit configured to enable the first and second output drivers to function as termination resistors in different timings from each other.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 24, 2015
    Assignee: PS4 Luxco S.a.r.l.
    Inventors: Atsushi Hiraishi, Toshio Sugano, Seiji Narui, Yasuhiro Takai
  • Publication number: 20140001639
    Abstract: Disclosed herein is a device that includes a silicon interposer having wiring lines on first and second wiring layers. The wiring lines includes first, second and third wiring lines provided on the first wiring layer and a fourth wiring line provided on the second wiring layer. The third wiring line is arranged between the first and second wiring lines on the first wiring layer. The fourth wiring line is overlapped with the third wiring line. Each of the first, second and fourth wiring lines conveys a power supply potential to first and second semiconductor chips mounted on the silicon interposer, and the third wiring line conveys a first signal communicated between the first and second semiconductor chips.
    Type: Application
    Filed: June 25, 2013
    Publication date: January 2, 2014
    Applicant: Elpida Memory, Inc.
    Inventors: Atsushi HIRAISHI, Toshio SUGANO, Yasuhiro TAKAI
  • Publication number: 20130070536
    Abstract: Disclosed herein is a device including a timing control circuit that receives a strobe signal supplied from outside to generate an internal strobe signal that is used as a timing signal to latch a data signal. An operation state of the timing control circuit is changed according to temperature change so as to keep an output timing of the internal strobe signal with respect to an input timing of the strobe signal.
    Type: Application
    Filed: September 4, 2012
    Publication date: March 21, 2013
    Inventor: Yasuhiro TAKAI
  • Patent number: 8205883
    Abstract: A transport path switching unit is provided between transport rollers and pre-registration rollers, and control is performed to switch between a main transport path and an extended transport path of the transport path switching unit such that either the main transport path or the extended transport path is interposed as the part of the paper transport path between the transport rollers and the pre-registration rollers to vary a total length of the paper transport path.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: June 26, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiko Fujita, Tadasu Taniguchi, Masaharu Kimura, Yasuaki Fukada, Masaya Asakawa, Yasuhiro Takai, Norichika Katsura, Masatsugu Ohishi