Patents by Inventor Uday Chandrasekhar

Uday Chandrasekhar 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: 8295098
    Abstract: Methods for sensing, memory devices, and memory systems are disclosed. In one such memory device, a local sense circuit provides sensing of an upper group of memory cells while a global sense circuit provides sensing of a lower group of memory cells. Data sensed by the local sense circuit is transferred to the global sense circuit over local data lines or a global transfer line that is multiplexed to the local data lines. An alternate embodiment uses the local sense circuit to sense both upper and lower groups of memory cells.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: October 23, 2012
    Assignee: Micron Technology, Inc.
    Inventors: Dean Nobunaga, William Kammerer, Uday Chandrasekhar
  • Publication number: 20120240011
    Abstract: The present disclosure includes methods and devices for data sensing. One such method includes performing a number of successive sense operations on a number of memory cells using a number of different sensing voltages, determining a quantity of the number memory cells that change states between consecutive sense operations of the number of successive sense operations, and determining, based at least partially on the determined quantity of the number of memory cells that change states between consecutive sense operations, whether to output hard data corresponding to one of the number of successive sense operations.
    Type: Application
    Filed: March 14, 2011
    Publication date: September 20, 2012
    Applicant: MICRON TECHNOLOGY, INC.
    Inventors: Mark A. Helm, Uday Chandrasekhar
  • Publication number: 20120170372
    Abstract: Memory devices and methods are disclosed, such as those facilitating data line shielding by way of capacitive coupling with data lines coupled to a memory string source line. For example, alternating data lines are sensed while adjacent data lines are coupled to a common source line of the data lines being sensed. Data line shielding methods and apparatus disclosed can reduce effects of source line bounce occurring during a sense operation of a memory device.
    Type: Application
    Filed: March 12, 2012
    Publication date: July 5, 2012
    Inventor: Uday CHANDRASEKHAR
  • Patent number: 8179726
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: May 15, 2012
    Assignee: Micron Technology, Inc.
    Inventors: Erwin E. Yu, Ebrahim Abedifard, Frederick T. Jaffin, Uday Chandrasekhar
  • Patent number: 8179724
    Abstract: Methods for sensing in a memory device and a memory device are disclosed. In one such sensing method, a single read operation with multiple sense amplifier circuit comparisons to a reference threshold level are performed to determine a state of a selected memory cell. A ramped voltage turns on the selected memory cell when the ramped voltage reaches the threshold voltage to which the selected memory cell is programmed. In one embodiment, the turned on memory cell discharges its respective bit line.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: May 15, 2012
    Assignee: Micron Technology, Inc.
    Inventors: Uday Chandrasekhar, Ebrahim Abedifard, Allahyar Vahidimowlavi
  • Patent number: 8134868
    Abstract: Memory devices and methods are disclosed, such as those facilitating data line shielding by way of capacitive coupling with data lines coupled to a memory string source line. For example, alternating data lines are sensed while adjacent data lines are coupled to a common source line of the data lines being sensed. Data line shielding methods and apparatus disclosed can reduce effects of source line bounce occurring during a sense operation of a memory device.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: March 13, 2012
    Assignee: Micron Technology, Inc.
    Inventor: Uday Chandrasekhar
  • Publication number: 20110310675
    Abstract: Methods for sensing, memory devices, and memory systems are disclosed. In one such memory device, a local sense circuit provides sensing of an upper group of memory cells while a global sense circuit provides sensing of a lower group of memory cells. Data sensed by the local sense circuit is transferred to the global sense circuit over local data lines or a global transfer line that is multiplexed to the local data lines. An alternate embodiment uses the local sense circuit to sense both upper and lower groups of memory cells.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Inventors: Dean Nobunaga, William Kammerer, Uday Chandrasekhar
  • Publication number: 20110235429
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Application
    Filed: June 7, 2011
    Publication date: September 29, 2011
    Inventors: Erwin E. Yu, Ebrahim Abedifard, Frederick T. Jaffin, Uday Chandrasekhar
  • Patent number: 7974129
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: July 5, 2011
    Assignee: Micron Technologies, Inc.
    Inventors: Erwin E. Yu, Ebrahim Abedifard, Frederick T. Jaffin, Uday Chandrasekhar
  • Publication number: 20110149660
    Abstract: Methods for sensing in a memory device and a memory device are disclosed. In one such sensing method, a single read operation with multiple sense amplifier circuit comparisons to a reference threshold level are performed to determine a state of a selected memory cell. A ramped voltage turns on the selected memory cell when the ramped voltage reaches the threshold voltage to which the selected memory cell is programmed. In one embodiment, the turned on memory cell discharges its respective bit line.
    Type: Application
    Filed: February 18, 2011
    Publication date: June 23, 2011
    Inventors: Uday Chandrasekhar, Ebrahim Abedifard, Allahyar Vahidimowlavi
  • Publication number: 20110063919
    Abstract: This disclosure concerns memory kink checking. One embodiment includes selectively applying one of a plurality of voltages to a first data line according to a programming status of a first memory cell, wherein the first memory cell is coupled to the first data line and to a selected access line. An effect on a second data line is determined, due at least in part to the voltage applied to the first data line and a capacitive coupling between at least the first data line and the second data line, wherein the second data line is coupled to a second memory cell, the second memory cell is adjacent to the first memory cell, and the second memory cell is coupled to the selected access line. A kink correction is applied to the second data line, responsive to the determined effect, during a subsequent programming pulse applied to the second memory cell.
    Type: Application
    Filed: September 14, 2009
    Publication date: March 17, 2011
    Applicant: Micron Technology, Inc.
    Inventors: Uday Chandrasekhar, Mark Helm
  • Patent number: 7903461
    Abstract: Methods for sensing in a memory device, a memory device, and a memory system are disclosed. In one such sensing method, a single read operation with multiple sense amplifier circuit comparisons to a reference threshold level are performed to determine a state of a selected memory cell. A ramped voltage turns on the selected memory cell when the ramped voltage reaches the threshold voltage to which the selected memory cell is programmed. In one embodiment, the turned on memory cell discharges its respective bit line.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: March 8, 2011
    Assignee: Micron Technology, Inc.
    Inventors: Uday Chandrasekhar, Ebrahim Abedifard, Allahyar Vahidimowlavi
  • Publication number: 20100211733
    Abstract: Memory devices and methods facilitate handling of data received by a memory device through the use of data grouping and assignment of data validity status values to grouped data. For example, data is received and delineated into one or more data groups and a data validity status is associated with each data group. Data groups having a valid status are latched into one or more cache registers for storage in an array of memory cells wherein data groups comprising an invalid status are rejected by the one or more cache registers.
    Type: Application
    Filed: February 19, 2009
    Publication date: August 19, 2010
    Inventors: Luyen Vu, Uday Chandrasekhar, Dean Nobunaga
  • Publication number: 20100110789
    Abstract: Memory devices and methods are disclosed, such as those facilitating data line shielding by way of capacitive coupling with data lines coupled to a memory string source line. For example, alternating data lines are sensed while adjacent data lines are coupled to a common source line of the data lines being sensed. Data line shielding methods and apparatus disclosed can reduce effects of source line bounce occurring during a sense operation of a memory device.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 6, 2010
    Inventor: Uday Chandrasekhar
  • Publication number: 20100110797
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Application
    Filed: January 12, 2010
    Publication date: May 6, 2010
    Inventors: Erwin E. Yu, Ebrahim Abedifard, Frederick T. Jaffin, Uday Chandrasekhar
  • Publication number: 20100074015
    Abstract: Methods for sensing in a memory device, a memory device, and a memory system are disclosed. In one such sensing method, a single read operation with multiple sense amplifier circuit comparisons to a reference threshold level are performed to determine a state of a selected memory cell. A ramped voltage turns on the selected memory cell when the ramped voltage reaches the threshold voltage to which the selected memory cell is programmed. In one embodiment, the turned on memory cell discharges its respective bit line.
    Type: Application
    Filed: September 22, 2008
    Publication date: March 25, 2010
    Inventors: Uday Chandrasekhar, Ebrahim Abedifard, Allahyar Vahidimowlavi
  • Patent number: 7663925
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: February 16, 2010
    Assignee: Micron Technology Inc.
    Inventors: Erwin E. Yu, Ebrahim Abedifard, Frederick T. Jaffin, Uday Chandrasekhar
  • Publication number: 20070263449
    Abstract: A method and apparatus that provides the ability to control programming pulses having different widths and/or voltages in a flash memory device. The widths and/or voltage levels of programming pulses are set to achieve programming of all memory cells of an array using a minimum number of programming pulses.
    Type: Application
    Filed: May 15, 2006
    Publication date: November 15, 2007
    Inventors: Erwin Yu, Ebrahim Abedifard, Frederick Jaffin, Uday Chandrasekhar