Patents by Inventor Xiang Yang

Xiang Yang 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: 20240071482
    Abstract: Technology is disclosed herein for mixed lockout verify. In a first programming phase, prior to a pre-determined data state completing verification, a no-lockout program verify is performed. After the pre-determined data state has completed verification, a lockout program verify is performed. The no-lockout verify may include charging all bit lines associated with the group to a sensing voltage to perform. The lockout verify may include selectively charging to the sensing voltage only bit lines associated with memory cells in the group to be verified. Bit lines associated with memory cells in the group that are not to be verified may be grounded to perform the lockout verify. The lockout verify saves considerable current and/or power. However, performing the lockout verify during the first programming phase may slow performance due to a need to scan the content in a remote set of data latches.
    Type: Application
    Filed: August 25, 2022
    Publication date: February 29, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Hua-Ling Cynthia Hsu
  • Publication number: 20240069803
    Abstract: The memory device has a plurality of memory blocks including a plurality of memory cells arranged in a plurality of word lines. The memory device also includes control circuitry that is in communication with the plurality of memory blocks. The control circuitry is configured to receive a data write instruction. The control circuitry is further configured to program the memory cells of the memory blocks to an SLC format. In response to the data programmed to the memory cells of the memory blocks in the SLC format reaching an SLC limit prior to completion of the data write instruction, without erasing the memory cells programmed to the SLC format, the control circuitry is configured to program the memory cells of at least some of the plurality of memory blocks from the SLC format to a TLC format.
    Type: Application
    Filed: August 30, 2022
    Publication date: February 29, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Wei Cao
  • Publication number: 20240055051
    Abstract: Technology is disclosed herein reconfiguring word lines as either data word lines or dummy word lines. In a sub-block mode reconfigurable word lines are used as dummy word lines that provide electrical isolation between data word lines in a block. The block may be divided into an upper tier, a middle tier, and a lower tier, with the reconfigurable word lines within the middle tier. In a full-block mode the reconfigurable group of the word lines are used as data word lines. Because the reconfigurable word lines are used as data word lines in the full-block mode storage capacity is greater in the full-block mode than in the sub-block mode. Moreover, because the sub-blocks are smaller in size but greater in number than the full-blocks, the memory system may be provisioned with fewer blocks and still meet user storage requirements in both the full-block mode and the sub-block mode.
    Type: Application
    Filed: August 15, 2022
    Publication date: February 15, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, YenLung Li, James Kai
  • Publication number: 20240055059
    Abstract: Non-volatile memory cells are programmed by pre-charging channels of unselected non-volatile memory cells connected to a selected data word line, boosting the channels of unselected non-volatile memory cells connected to the selected data word line after the pre-charging and applying a program voltage pulse to selected non-volatile memory cells connected to the selected data word line while boosting. The pre-charging includes applying pre-charge voltages to one set of data word lines and dummy word line(s) as well as applying overdrive voltages to another set of data word lines connected to already programmed memory cells. At the end of the pre-charging, the dummy word lines are ramped down to a resting voltage prior to lowering the data word lines to one or more resting voltages.
    Type: Application
    Filed: August 10, 2022
    Publication date: February 15, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Jiacen Guo, Dengtao Zhao, Xiang Yang
  • Patent number: 11894067
    Abstract: A memory apparatus and method of operation are provided. The memory apparatus includes memory cells configured to retain a threshold voltage. The memory cells are connected to one of a plurality of word lines and are arranged in strings comprising a plurality of blocks. A control means is coupled to the plurality of word lines and the strings and is configured to periodically determine a read frequency metric associated with a plurality of read operations of one of the plurality of blocks of the memory cells. The control means is also configured to relocate data of the one of the plurality of blocks and cause the one of the plurality of blocks to remain unused for a predetermined relaxation time based on the read frequency metric.
    Type: Grant
    Filed: December 15, 2021
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Xiang Yang, Abhijith Prakash, Shubhajit Mukherjee
  • Patent number: 11894062
    Abstract: A memory apparatus and method of operation are provided. The apparatus includes apparatus including memory cells connected to word lines including at least one dummy word line and data word lines. The memory cells are arranged in strings and are configured to retain a threshold voltage. The apparatus also includes a control means coupled to the word lines and the strings and configured to identify ones of the memory cells connected to the at least one dummy word line with the threshold voltage being below a predetermined detection voltage threshold following an erase operation. The control means is also configured to selectively apply at least one programming pulse of a maintenance program voltage to the at least one dummy word line to program the ones of the memory cells connected to the at least one dummy word line having the threshold voltage being below the predetermined detection voltage threshold.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Xiang Yang, Deepanshu Dutta, Gerrit Jan Hemink, Shubhajit Mukherjee
  • Patent number: 11894072
    Abstract: A memory apparatus and method of operation are provided. The apparatus includes memory cells connected to word lines and disposed in strings. A control means is coupled to the word lines and the strings and is configured to ramp a voltage applied to a selected one of the word lines from a verify voltage to a reduced voltage during a program-verify portion of a program operation. The control means successively ramps voltages applied to each of a plurality of neighboring ones of the word lines from a read pass voltage to the reduced voltage beginning with ones of the plurality of neighboring ones of the word lines immediately adjacent the selected one of the word lines and progressing to ones of the plurality of neighboring others of the word lines disposed increasingly remotely from the selected one of the word lines during the program-verify portion of the program operation.
    Type: Grant
    Filed: April 20, 2022
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Jiacen Guo, Xiang Yang, Abhijith Prakash
  • Patent number: 11894064
    Abstract: The memory device includes a block with a plurality of memory cells arranged in a plurality of data word lines, which are arranged in sub-blocks that are not separated from one another by physical joints or by dummy word lines. A controller is configured to erase the memory cells of a selected sub-block of the plurality of sub-blocks without erasing the memory cells of the unselected sub-blocks. The controller reads data of the edge one word lines of the unselected sub-blocks adjacent the selected sub-block and stores this data in a temporary location external of the block before erasing the memory cells of the selected sub-block. The controller then re-programs the data that is being temporarily stored back into the memory cells of the edge word lines of the unselected sub-blocks after erase of the selected sub-block is completed.
    Type: Grant
    Filed: January 25, 2022
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventor: Xiang Yang
  • Patent number: 11894073
    Abstract: A memory apparatus and method of operation are provided. The apparatus includes memory cells connected to one of a plurality of word lines including at least one edge word line and a plurality of other data word lines. The memory cells are arranged in strings and configured to retain a threshold voltage corresponding to one of a plurality of data states. The memory apparatus also includes a control means coupled to the plurality of word lines and the strings. The control means is configured to identify the at least one edge word line. The control means is also configured to periodically apply a program voltage to the at least one edge word line to reprogram the memory cells associated with the at least one edge word line without erasing the memory cells associated with the at least one edge word line.
    Type: Grant
    Filed: September 28, 2021
    Date of Patent: February 6, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventor: Xiang Yang
  • Patent number: 11884661
    Abstract: The present invention provides compounds of Formula (I): or stereoisomers, tautomers, or pharmaceutically acceptable salts or solvates thereof, wherein all the variables are as defined herein. These compounds are antagonists to ?V-containing integrins. This invention also relates to pharmaceutical compositions comprising these compounds and methods of treating a disease, disorder, or condition associated with dysregulation of ?v-containing integrins, such as pathological fibrosis, transplant rejection, cancer, osteoporosis, and inflammatory disorders, by using the compounds and pharmaceutical compositions.
    Type: Grant
    Filed: February 24, 2021
    Date of Patent: January 30, 2024
    Assignee: Bristol-Myers Squibb Company
    Inventors: Guohua Zhao, Pratik Devasthale, Xiang-Yang Ye, Kumaravel Selvakumar, Suresh Dhanusu, Palanikumar Balasubramanian, Leatte R. Guernon, Rita Civiello, Xiaojun Han, Michael Frederick Parker, Swanee E. Jacutin-Porte
  • Publication number: 20240029806
    Abstract: In a non-volatile memory system that performs programming of selected memory cells (in coordination with pre-charging and boosting of channels for unselected memory cells) and program-verify to determine whether the programming was successful, the system transitions from program-verify to the next dose of programming by concurrently lowering a voltage applied to a selected word line and voltages applied to word lines on a first side of the selected word line at the conclusion of program-verify. Subsequent to lowering the voltage applied to the selected word line, the system successively lowers voltages applied to groups of one or more word lines on a second side of the selected word line at the conclusion of program-verify beginning with a group of one or more word lines immediately adjacent the selected word line and progressing to other groups of one or more word lines disposed increasingly remote from the selected word line.
    Type: Application
    Filed: July 25, 2022
    Publication date: January 25, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Jiacen Guo, Peng Zhang, Xiang Yang, Yanli Zhang
  • Publication number: 20240029789
    Abstract: The memory die that includes a plurality of memory blocks. Each memory block includes a plurality of memory cells that are configured to store three bits of data in each memory cell when the memory die is in a TLC operating mode. The memory die has a non-binary data capacity, which is a multiple of 683 Gb, when the memory die is operating in the TLC operating mode.
    Type: Application
    Filed: July 21, 2022
    Publication date: January 25, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Deepanshu Dutta
  • Patent number: 11881266
    Abstract: A memory apparatus and method of operation are provided. The memory apparatus includes memory cells connected to word lines and disposed in memory holes organized in rows grouped in strings. The memory cells are configured to retain a threshold voltage. The rows include full circle rows and semi-circle rows in which the memory holes are partially cut by a slit half etch. The memory holes of the semi-circle rows are coupled semi-circle bit lines and the memory holes of the full circle rows are coupled to full circle bit lines. A control means is configured to erase the memory cells in an erase operation. During the erase operation, the control means creates a capacitive coupling between each of the semi-circle bit lines and at least one neighboring one of the full circle bit lines to increase a semi-circle erase voltage applied to each of the semi-circle bit lines.
    Type: Grant
    Filed: February 8, 2022
    Date of Patent: January 23, 2024
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Kou Tei, Ohwon Kwon
  • Patent number: 11881271
    Abstract: To save power during a read process, NAND strings of each sub-block of a block have independently controlled source side select lines connected to source side select gates and drain side select lines connected to drain side select gates so that NAND strings of unselected sub-blocks can float and not draw current. To prevent read disturb in NAND strings of unselected sub-blocks, after all word lines are raised to a pass gate voltage, unselected word lines nearby the selected word line are lowered to respective intermediate voltages while lowering the voltage on the selected word line in order to achieve a channel potential gradient in the floated NAND strings of the unselected sub-blocks that does not result in read disturb. Subsequently, the selected word line is raised to the appropriate read compare voltage so the selected memory cells can be sensed.
    Type: Grant
    Filed: May 31, 2022
    Date of Patent: January 23, 2024
    Assignee: SanDisk Technologies LLC
    Inventors: Jiacen Guo, Xiang Yang, Xiaochen Zhu
  • Patent number: 11871580
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers located over a substrate, an array of memory opening fill structures located within an array of memory openings vertically extending through the alternating stack, and a drain-select-level isolation structure vertically extending through drain-select-level electrically conductive layers between two rows of memory opening fill structures. The drain-select-level isolation structure may comprise a low-k dielectric material or an air gap.
    Type: Grant
    Filed: May 11, 2021
    Date of Patent: January 9, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Peng Zhang, Yanli Zhang, Xiang Yang, Koichi Matsuno, Masaaki Higashitani, Johann Alsmeier
  • Patent number: 11862249
    Abstract: In order to inhibit memory cells from programming and mitigate program disturb, the memory pre-charges channels of NAND strings connected to a common set of control lines by applying positive voltages to the control lines and applying voltages to a source line and bit lines connected to the NAND strings. The control lines include word lines and select lines. The word lines include an edge word line. The memory ramps down the positive voltages applied to the control lines, including ramping down control lines on a first side of the edge word line, ramping down the edge word line, and performing a staggered ramp down of three or more control lines on a second side of the edge word line. After the pre-charging, unselected NAND strings have their channel boosted to prevent programming and selected NAND strings experience programming on selected memory cells.
    Type: Grant
    Filed: November 16, 2021
    Date of Patent: January 2, 2024
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Fanqi Wu, Jiacen Guo, Jiahui Yuan
  • Publication number: 20230410921
    Abstract: An apparatus is provided that includes a plurality of memory cells, logic circuits coupled to the memory cells and configured to store 4-bit data in each of the memory cells, and a control circuit coupled to the memory cells and the logic circuits. The control circuit configured to cause the logic circuits to store 3-bit data in each of the memory cells.
    Type: Application
    Filed: June 21, 2022
    Publication date: December 21, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Deepanshu Dutta, Jiacen Guo, Takayuki Inoue, Hua-Ling Hsu
  • Publication number: 20230410912
    Abstract: A memory apparatus and method of operation are provided. The apparatus includes drain-side select gate transistors for coupling to a drain-side of each of a plurality of memory holes of memory cells and configured to retain a transistor threshold voltage. The memory apparatus also includes a control means coupled to the drain-side select gate transistor of each of the plurality of memory holes. The control means is configured to select the transistor threshold voltage of the drain-side select gate transistors as a stable transistor threshold voltage for a grouping of the memory cells to minimize shifting of the transistor threshold voltage following a plurality of read operations of the memory cells. The control means is also configured to program the transistor threshold voltage of the drain-side select gate transistor of the plurality of memory holes associated with the grouping of the memory cells to the stable transistor threshold voltage.
    Type: Application
    Filed: June 15, 2022
    Publication date: December 21, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Abhijith Prakash, Xiang Yang
  • Publication number: 20230410906
    Abstract: An apparatus includes a control circuit configured to connect to memory cells connected in series in NAND strings. Each NAND string includes a plurality of data memory cells coupled to a plurality of data word lines in series with a plurality of dummy memory cells connected to a plurality of dummy word lines. The control circuit configured to apply a first dummy word line voltage to one or more dummy word lines of the plurality of dummy word lines in a verify step of a program operation to program data memory cells. The control circuit is configured to apply a second dummy word line voltage to the one or more dummy word lines in a read operation to read the data memory cells.
    Type: Application
    Filed: May 25, 2022
    Publication date: December 21, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Yi Song, Jiahui Yuan, Xiang Yang
  • Publication number: 20230409230
    Abstract: Memory die management based on biasing voltages. Some memory dies are formed of memory holes having a semi-circular shape. This semi-circular shape results in a decrease in biasing voltage compared to memory holes having a circular shape. Systems and methods described herein organize memory dies into memory die groups according to their biasing voltages. During operation, data is relocated between the memory die groups based on how often the data is read. Data may be scrambled within their respective memory die groups to maintain appropriate storage space.
    Type: Application
    Filed: May 17, 2022
    Publication date: December 21, 2023
    Inventors: Abhijith Prakash, Xiang Yang