Patents by Inventor Christopher Johnson Kawamura

Christopher Johnson Kawamura 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).

  • Ground reference scheme for a memory cell
    Patent number: 10978126
    Abstract: Methods, systems, and devices for operating a ferroelectric memory cell or cells are described. A ground reference scheme may be employed in a digit line voltage sensing operation. A positive voltage may be applied to a memory cell; and after a voltage of the digit line of the cell has reached a threshold, a negative voltage may be applied to cause the digit line voltages to center around ground before a read operation. In another example, a first voltage may be applied to a memory cell and then a second voltage that is equal to an inverse of the first voltage may be applied to a reference capacitor that is in electronic communication with a digit line of the memory cell to cause the digit line voltages to center around ground before a read operation.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: April 13, 2021
    Inventors: Daniele Vimercati, Scott James Derner, Umberto Di Vincenzo, Christopher Johnson Kawamura, Eric S. Carman
  • GROUND REFERENCE SCHEME FOR A MEMORY CELL
    Publication number: 20190130955
    Abstract: Methods, systems, and devices for operating a ferroelectric memory cell or cells are described. A ground reference scheme may be employed in a digit line voltage sensing operation. A positive voltage may be applied to a memory cell; and after a voltage of the digit line of the cell has reached a threshold, a negative voltage may be applied to cause the digit line voltages to center around ground before a read operation. In another example, a first voltage may be applied to a memory cell and then a second voltage that is equal to an inverse of the first voltage may be applied to a reference capacitor that is in electronic communication with a digit line of the memory cell to cause the digit line voltages to center around ground before a read operation.
    Type: Application
    Filed: November 8, 2018
    Publication date: May 2, 2019
    Inventors: Daniele Vimercati, Scott James Derner, Umberto Di Vincenzo, Christopher Johnson Kawamura, Eric S. Carman