Patents by Inventor Amul DESAI

Amul DESAI 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: 10861559
    Abstract: A methodology and structure for selectively erases a group of strings in a vertical NAND memory array to account for the slow to erase memory cells in the inner strands compared to the outer strands in the group. Erase signals can be applied through both the drain side connections and the source side connections in a first step to erase the outer strings. A second erase signal can be applied to the inner strands to erase the inner strands. The second signal can be applied from just the drain side connections or through both the drain side connections and the source side connections. In another embodiment, the erase signals are applied from both the source side connections and the drain side connections to the inner strings and only from the source side connections to the outer strings.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: December 8, 2020
    Assignee: SanDisk Technologies LLC
    Inventors: Amul Desai, Jayavel Pachamuthu
  • Patent number: 10229744
    Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of the memory cells can shift depending on the coupled up state of the word lines. In one approach, for a read operation, a representative word line voltage in a block is detected and a corresponding set of read voltages is selected. In another approach, a pre-read voltage pulse is applied to a selected word line in response to a read command, just prior to reading the selected cells. In another approach, a voltage pulse is periodically applied to each word line in a block to provide the word lines in a coupled up state. In another approach, a soft erase is performed after a read operation to prevent coupling up of the word lines.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: March 12, 2019
    Assignee: SanDisk Technologies LLC
    Inventors: Deepanshu Dutta, Idan Alrod, Huai-Yuan Tseng, Amul Desai, Jun Wan, Ken Cheah, Sarath Puthenthermadam
  • Patent number: 10090057
    Abstract: Apparatuses, systems, methods, and computer program products are disclosed for dynamic strobe timing. A controller is configured to generate a strobe signal to facilitate data transfer. A controller is configured to receive a feedback signal in response to initiation of a strobe signal. A controller is configured to control a duration of a strobe signal based on a feedback signal.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: October 2, 2018
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Amul Desai, Khanh Nguyen
  • Publication number: 20180254090
    Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of the memory cells can shift depending on the coupled up state of the word lines. In one approach, for a read operation, a representative word line voltage in a block is detected and a corresponding set of read voltages is selected. In another approach, a pre-read voltage pulse is applied to a selected word line in response to a read command, just prior to reading the selected cells. In another approach, a voltage pulse is periodically applied to each word line in a block to provide the word lines in a coupled up state. In another approach, a soft erase is performed after a read operation to prevent coupling up of the word lines.
    Type: Application
    Filed: November 17, 2017
    Publication date: September 6, 2018
    Applicant: SanDisk Technologies LLC
    Inventors: Deepanshu Dutta, Idan Alrod, Huai-Yuan Tseng, Amul Desai, Jun Wan, Ken Cheah, Sarath Puthenthermadam
  • Publication number: 20180240526
    Abstract: Apparatuses, systems, methods, and computer program products are disclosed for dynamic strobe timing. A controller is configured to generate a strobe signal to facilitate data transfer. A controller is configured to receive a feedback signal in response to initiation of a strobe signal. A controller is configured to control a duration of a strobe signal based on a feedback signal.
    Type: Application
    Filed: February 23, 2017
    Publication date: August 23, 2018
    Applicant: SanDisk Technologies LLC
    Inventors: Amul Desai, Khanh Nguyen
  • Patent number: 10026486
    Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of the memory cells can shift depending on the coupled up state of the word lines. In one approach, for a read operation, a representative word line voltage in a block is detected and a corresponding set of read voltages is selected. In another approach, a pre-read voltage pulse is applied to a selected word line in response to a read command, just prior to reading the selected cells. In another approach, a voltage pulse is periodically applied to each word line in a block to provide the word lines in a coupled up state. In another approach, a soft erase is performed after a read operation to prevent coupling up of the word lines.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: July 17, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Deepanshu Dutta, Idan Alrod, Huai-Yuan Tseng, Amul Desai, Jun Wan, Ken Cheah, Sarath Puthenthermadam
  • Patent number: 9959915
    Abstract: The present disclosure describes a system, a circuit, and method for process and temperature compensation in an integrated circuit. For example, the system includes a bus, a data latch, and a voltage generator. The data latch includes a plurality of transistors coupled to the bus. The voltage generator includes a tracking transistor with one or more physical characteristics that substantially match one or more respective physical characteristics—e.g., gate width and gate length dimensions—of at least one of the plurality of transistors in the data latch. The voltage generator is configured to adjust a pre-charged voltage on the bus based on an electrical characteristic of the tracking transistor.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: May 1, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Amul Desai, Hao Nguyen, Man Mui, Ohwon Kwon
  • Publication number: 20170169867
    Abstract: The present disclosure describes a system, a circuit, and method for process and temperature compensation in an integrated circuit. For example, the system includes a bus, a data latch, and a voltage generator. The data latch includes a plurality of transistors coupled to the bus. The voltage generator includes a tracking transistor with one or more physical characteristics that substantially match one or more respective physical characteristics—e.g., gate width and gate length dimensions—of at least one of the plurality of transistors in the data latch. The voltage generator is configured to adjust a pre-charged voltage on the bus based on an electrical characteristic of the tracking transistor.
    Type: Application
    Filed: May 11, 2016
    Publication date: June 15, 2017
    Applicant: SanDisk Technologies, LLC
    Inventors: Amul DESAI, Hao Nguyen, Man Mui, Ohwon Kwon