Patents by Inventor Yukeun Sim

Yukeun Sim 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: 20240339994
    Abstract: Certain aspects of the present disclosure provide techniques and apparatus for generating oscillating signals and for wireless communication, such as a frequency synthesizer architecture using a step-symmetric inductor. An example frequency synthesizer generally includes an oscillator and a frequency adjustment circuit, an output of the oscillator being coupled to an input of the frequency adjustment circuit, the frequency adjustment circuit comprising a step-symmetric inductive element. An example transceiver generally includes the frequency synthesizer described herein, as well as a mixer having a local-oscillator (LO) input coupled to an output of the frequency adjustment circuit; and an amplifier coupled to the mixer.
    Type: Application
    Filed: April 6, 2023
    Publication date: October 10, 2024
    Inventors: Mazhareddin TAGHIVAND, Sang Oh LEE, Shinwoong PARK, Ayse YESILYURT, Doohwan JUNG, Rupal GUPTA, Hongbing WU, Yukeun SIM, Jingang PIAO
  • Patent number: 10290332
    Abstract: A system may include a controller, a data receiving circuit, and a plurality of banks. The banks may send data to the data receiving circuit via a common data bus. The controller may control the communication of the data to the receiving circuit by sending control signals and clock signals to the banks. Relative lengths of control signal paths and clock signal paths may be directly related to each other and inversely related to relative lengths of data paths.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: May 14, 2019
    Assignee: SanDisk Technologies LLC
    Inventors: Yukeun Sim, Anurag Nigam, Yingchang Chen
  • Publication number: 20190130946
    Abstract: A system may include a controller, a data receiving circuit, and a plurality of banks. The banks may send data to the data receiving circuit via a common data bus. The controller may control the communication of the data to the receiving circuit by sending control signals and clock signals to the banks. Relative lengths of control signal paths and clock signal paths may be directly related to each other and inversely related to relative lengths of data paths.
    Type: Application
    Filed: October 31, 2017
    Publication date: May 2, 2019
    Inventors: Yukeun Sim, Anurag Nigam, Yingchang Chen
  • Patent number: 10269444
    Abstract: Techniques and memory devices are provided in which bit line short circuits are detected and groups of bit lines are masked off. A process tests groups of bit lines which are connected to a sense circuit. A masking latch is provided to store test results for each group of bit lines. Once the testing of a group is completed, the test result is communicated to a controller. Moreover, the same masking latch can store and communicate test results for multiple groups of bit lines which are connected to a sense circuit. In a user mode, a masking latch stores masking data for each group of bit lines. In response to a power on reset, the masking data is loaded into the masking latches and remains there over multiple write and read operation, until a next power on reset occurs.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: April 23, 2019
    Assignee: SanDisk Technologies LLC
    Inventors: Anurag Nigam, Yukeun Sim, Jingwen Ouyang, Yingchang Chen
  • Patent number: 10241938
    Abstract: Apparatuses, systems, and methods are disclosed for an output data path for non-volatile memory. A buffer may include a plurality of buffer stages. A buffer stage width may be a width of an internal bus for a non-volatile memory element. A buffer may include two or more read pointers, updated by an internal controller at different times in response to different portions of a clock signal. A parallel-in serial-out (PISO) component may receive data via an internal data path having a data path width equal to an internal bus width, and may output the data in a series of transfers controlled according to a clock signal, via an output bus having an output bus width narrower than an internal bus width. A PISO component may receive data from a portion of a buffer stage in response to an internal controller updating a read pointer to point to the buffer stage.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: March 26, 2019
    Assignee: SanDisk Technologies LLC
    Inventors: Yukeun Sim, Yingchang Chen
  • Publication number: 20180174668
    Abstract: Techniques and memory devices are provided in which bit line short circuits are detected and groups of bit lines are masked off. A process tests groups of bit lines which are connected to a sense circuit. A masking latch is provided to store test results for each group of bit lines. Once the testing of a group is completed, the test result is communicated to a controller. Moreover, the same masking latch can store and communicate test results for multiple groups of bit lines which are connected to a sense circuit. In a user mode, a masking latch stores masking data for each group of bit lines. In response to a power on reset, the masking data is loaded into the masking latches and remains there over multiple write and read operation, until a next power on reset occurs.
    Type: Application
    Filed: April 19, 2017
    Publication date: June 21, 2018
    Applicant: SanDisk Technologies LLC
    Inventors: Anurag Nigam, Yukeun Sim, Jingwen Ouyang, Yingchang Chen
  • Patent number: 9660647
    Abstract: A calibration device for use in a memory system includes a bias circuit providing bias current, and a calibration unit generating a control signal for calibration. The bias circuit includes an internal resistor and measures a second bias current generated by mirroring a first bias current through the internal resistor, and adjusts the second bias current to generate the second bias current in a predetermined range as a third bias current. The calibration unit generates the control signal based on a comparison result between a reference voltage and a voltage generated based on the third bias current through an adjustable resistor.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 23, 2017
    Assignee: SK hynix memory solutions Inc.
    Inventors: Jenn-Gang Chern, Yukeun Sim
  • Patent number: 9531354
    Abstract: A random number generator is disclosed. In some embodiments, the random number generator comprises two cross-coupled inverter chains, wherein each inverter chain comprises an odd number of gates including an input NAND gate; wherein when a clock signal input into the NAND gate of both inverter chains switches from low to high, the inverter chains start toggling until a noise induced phase difference automatically collapses the toggling after a random number of cycles; and wherein a random number generated by the random number generator is based on the random number of cycles.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: December 27, 2016
    Assignee: SK hynix memory solutions Inc.
    Inventor: Yukeun Sim
  • Publication number: 20160118984
    Abstract: A calibration device for use in a memory system includes a bias circuit providing bias current, and a calibration unit generating a control signal for calibration. The bias circuit includes an internal resistor and measures a second bias current generated by mirroring a first bias current through the internal resistor, and adjusts the second bias current to generate the second bias current in a predetermined range as a third bias current. The calibration unit generates the control signal based on a comparison result between a reference voltage and a voltage generated based on the third bias current through an adjustable resistor.
    Type: Application
    Filed: October 27, 2015
    Publication date: April 28, 2016
    Inventors: Jenn-Gang Chern, Yukeun Sim