Patents by Inventor Xue Bai Pitner

Xue Bai Pitner 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: 11972814
    Abstract: The memory device includes a plurality of memory cells, which include a first set of memory cells and a second set of memory cells. A controller is in communication with the memory cells. The controller is configured to, in a first programming pass and then a second programming pass, program the memory cells of the first and second sets to respective final threshold voltages associated with a plurality of programmed data states. The controller is further configured to, in the first programming pass, verify the first set of memory cells at a first set of checkpoint data states and verify the second set of memory cells at a second set of checkpoint data states that is different than the first set of checkpoint data states.
    Type: Grant
    Filed: March 22, 2022
    Date of Patent: April 30, 2024
    Assignee: SanDisk Technologies, LLC
    Inventors: Xue Bai Pitner, Yu-Chung Lien, Ravi Kumar, Jiahui Yuan, Bo Lei, Zhenni Wan
  • Patent number: 11894081
    Abstract: A method for programming a target memory cell of a memory array of a non-volatile memory system, the method comprises determining a total number of erase/programming (EP) cycles that were applied previously to the memory cell and, (1) if the determined total number of cycles does not exceed a threshold value, applying an asymmetric programming scheme, and, (2) if the determined total number of cycles exceeds the threshold value, applying a symmetric programming scheme. Further, a magnitude of a boosting voltage bias (VPASS) that is to be applied to an unselected word line may be determined according to the determined total number of erase/programming (EP) cycles.
    Type: Grant
    Filed: March 2, 2022
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Yu-Chung Lien, Xue Bai Pitner, Ken Oowada
  • Publication number: 20230307071
    Abstract: The memory device includes a plurality of memory cells, which include a first set of memory cells and a second set of memory cells. A controller is in communication with the memory cells. The controller is configured to, in a first programming pass and then a second programming pass, program the memory cells of the first and second sets to respective final threshold voltages associated with a plurality of programmed data states. The controller is further configured to, in the first programming pass, verify the first set of memory cells at a first set of checkpoint data states and verify the second set of memory cells at a second set of checkpoint data states that is different than the first set of checkpoint data states.
    Type: Application
    Filed: March 22, 2022
    Publication date: September 28, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Yu-Chung Lien, Ravi Kumar, Jiahui Yuan, Bo Lei, Zhenni Wan
  • Publication number: 20230282295
    Abstract: A method for programming a target memory cell of a memory array of a non-volatile memory system, the method comprises determining a total number of erase/programming (EP) cycles that were applied previously to the memory cell and, (1) if the determined total number of cycles does not exceed a threshold value, applying an asymmetric programming scheme, and, (2) if the determined total number of cycles exceeds the threshold value, applying a symmetric programming scheme. Further, a magnitude of a boosting voltage bias (VPASS) that is to be applied to an unselected word line may be determined according to the determined total number of erase/programming (EP) cycles.
    Type: Application
    Filed: March 2, 2022
    Publication date: September 7, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Yu-Chung Lien, Xue Bai Pitner, Ken Oowada
  • Patent number: 11749736
    Abstract: A memory device includes an alternating stack of insulating layers and electrically conductive layers, a memory opening vertically extending through the alternating stack, and memory opening fill structures located in the memory opening and including a vertical semiconductor channel, a dielectric material liner laterally surrounding the vertical semiconductor channel, and a vertical stack of discrete memory elements laterally surrounding the dielectric material liner. A subset of the insulating layers a lower insulating sublayer, an upper insulating sublayer overlying the lower insulating sublayer, and a center insulating sublayer located between and in contact with the lower insulating sublayer and the upper insulating sublayer.
    Type: Grant
    Filed: March 1, 2021
    Date of Patent: September 5, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Xue Bai Pitner, Raghuveer S. Makala, Fei Zhou, Senaka Kanakamedala, Ramy Nashed Bassely Said
  • Patent number: 11699494
    Abstract: A method for programming a memory block of a non-volatile memory structure, wherein the method provides, during a program verify operation, selecting only a partial segment of memory cells of a memory block for bit scan mode, applying a sensing bias voltage to one or more bit lines of the memory block associated with the selected memory cells, and initiating a bit scan mode of the selected memory cells.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: July 11, 2023
    Inventors: Xue Bai Pitner, Yu-Chung Lien, Deepanshu Dutta, Huai-yuan Tseng, Ravi Kumar
  • Publication number: 20230197173
    Abstract: A method for performing a program verify operation with respect to a target memory cell in a memory structure of a non-volatile memory system, wherein the method may comprise determining a location of the target memory cell within the structure and, based upon the determined location of the target cell and with respect to each programmable memory state: (1) applying a first sense signal at a first point in time, and (2) applying a second sense signal at a second point in time, wherein a time interval between the first and the second points in time is equal to a predetermined optimal time period plus or minus an offset parameter time value.
    Type: Application
    Filed: December 17, 2021
    Publication date: June 22, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Prafful Golani, Ravi Kumar
  • Patent number: 11568943
    Abstract: A memory apparatus and method of operation is provided. The apparatus includes a block of memory cells. Each of the memory cells is connected to one of a plurality of word lines and are also arranged in strings and configured to retain a threshold voltage within a common range of threshold voltages. A control circuit coupled to the plurality of word lines and the strings is configured to determine an erase upper tail voltage of a distribution of the threshold voltage of the memory cells following an erase operation. The erase upper tail voltage corresponds to a cycling condition of the memory cells. The control circuit is also configured to calculate a program voltage to apply to each of selected ones of the plurality of word lines associated with the memory cells to program the memory cells during a program operation based on the erase upper tail voltage.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: January 31, 2023
    Assignee: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Dengtao Zhao, Deepanshu Dutta, Ravi Kumar
  • Publication number: 20220392552
    Abstract: A method for programming a memory block of a non-volatile memory structure, wherein the method comprises, during a program verify operation, selecting only a partial segment of memory cells of a memory block for bit scan mode, applying a sensing bias voltage to one or more bit lines of the memory block associated with the selected memory cells, and initiating a bit scan mode of the selected memory cells.
    Type: Application
    Filed: June 7, 2021
    Publication date: December 8, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Yu-Chung Lien, Deepanshu Dutta, Huai-Yuan Tseng, Ravi Kumar
  • Publication number: 20220278216
    Abstract: A memory device includes an alternating stack of insulating layers and electrically conductive layers, a memory opening vertically extending through the alternating stack, and memory opening fill structures located in the memory opening and including a vertical semiconductor channel, a dielectric material liner laterally surrounding the vertical semiconductor channel, and a vertical stack of discrete memory elements laterally surrounding the dielectric material liner. A subset of the insulating layers a lower insulating sublayer, an upper insulating sublayer overlying the lower insulating sublayer, and a center insulating sublayer located between and in contact with the lower insulating sublayer and the upper insulating sublayer.
    Type: Application
    Filed: March 1, 2021
    Publication date: September 1, 2022
    Inventors: Xue Bai PITNER, Raghuveer S. MAKALA, Fei ZHOU, Senaka KANAKAMEDALA, Ramy Nashed Bassely SAID
  • Publication number: 20220165342
    Abstract: A memory apparatus and method of operation is provided. The apparatus includes a block of memory cells each connected to one of a plurality of word lines and arranged in strings and configured to retain a threshold voltage. A control circuit couples to the word lines and the strings determines a program lower tail voltage of a distribution of the threshold voltage following a first program pulse. The control circuit calculates a second program voltage of a second program pulse based on the program lower tail voltage and applies the second program pulse to each of selected ones of the plurality of word lines associated with the memory cells to program the memory cells such that the distribution of the threshold voltage of the memory cells have a desired program lower tail voltage without further program pulses.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 26, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Deepanshu Dutta, Ravi Kumar
  • Publication number: 20220165341
    Abstract: A memory apparatus and method of operation is provided. The apparatus includes a block of memory cells. Each of the memory cells is connected to one of a plurality of word lines and are also arranged in strings and configured to retain a threshold voltage within a common range of threshold voltages. A control circuit coupled to the plurality of word lines and the strings is configured to determine an erase upper tail voltage of a distribution of the threshold voltage of the memory cells following an erase operation. The erase upper tail voltage corresponds to a cycling condition of the memory cells. The control circuit is also configured to calculate a program voltage to apply to each of selected ones of the plurality of word lines associated with the memory cells to program the memory cells during a program operation based on the erase upper tail voltage.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 26, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Dengtao Zhao, Deepanshu Dutta, Ravi Kumar
  • Patent number: 11342035
    Abstract: A memory apparatus and method of operation is provided. The apparatus includes a block of memory cells each connected to one of a plurality of word lines and arranged in strings and configured to retain a threshold voltage. A control circuit couples to the word lines and the strings determines a program lower tail voltage of a distribution of the threshold voltage following a first program pulse. The control circuit calculates a second program voltage of a second program pulse based on the program lower tail voltage and applies the second program pulse to each of selected ones of the plurality of word lines associated with the memory cells to program the memory cells such that the distribution of the threshold voltage of the memory cells have a desired program lower tail voltage without further program pulses.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: May 24, 2022
    Assignee: SanDisk Technologies LLC
    Inventors: Xue Bai Pitner, Deepanshu Dutta, Ravi Kumar
  • Patent number: 10435814
    Abstract: A single-crystalline metal is created on a substrate by liquefying a metal material contained within a crucible while in contact with a surface of the substrate, cooling the metal material by causing a temperature gradient effected in the substrate in a direction that is neutral along the surface of the substrate and, therein, growing the single-crystalline metal in the crucible.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: October 8, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: James D. Plummer, Kai Zhang, Xue Bai Pitner, Jonathan A. Fan
  • Publication number: 20170121843
    Abstract: A single-crystalline metal is created on a substrate by liquefying a metal material contained within a crucible while in contact with a surface of the substrate, cooling the metal material by causing a temperature gradient effected in the substrate in a direction that is neutral along the surface of the substrate and, therein, growing the single-crystalline metal in the crucible.
    Type: Application
    Filed: October 31, 2016
    Publication date: May 4, 2017
    Inventors: James D. Plummer, Kai Zhang, Xue Bai Pitner, Jonathan A. Fan