Patents by Inventor Zhen Wu Liu

Zhen Wu Liu 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: 8482316
    Abstract: Circuits, methods, and systems are presented for managing current leakage in an electronic circuit. One circuit includes a keeper circuit, and a controller. The keeper circuit supplies current to a leaker circuit, which is experiencing current leakage, to compensate for the current leakage. Further, the controller provides to the keeper circuit a control signal that is based on the current leakage. The control signal has a cycle equal to the cycle of a clock signal, and the control signal is a pulse having a first value during a first period, and a second value during a second period of the pulse. The keeper circuit provides a current to the leaker circuit during the first period and the keeper circuit withholds the current to the leaker circuit during the second period, where the durations of the first period and the second period are based on the current leakage.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: July 9, 2013
    Assignee: Oracle International Corporation
    Inventors: Zhen Wu Liu, Shree Kant, Heechoul Park
  • Patent number: 7484061
    Abstract: A method and apparatus is provided to enable provision of requested data within two clock cycles when performing a swap operation between an accessible memory cell and a background memory in a computer. In a first clock cycle, memory addresses to be used in the swap operation are decoded. In a high phase of a second clock cycle, requested data is restored from the background memory to an accessible memory cell. Because the data previously stored in the accessible memory cell is duplicated in a shadow memory cell, the restoration of data to the accessible memory cell is performed without data loss. In a low phase of the second clock cycle, the requested data is available for reading. During a third cycle, data is saved from the shadow memory cell to the background memory, and the shadow memory cell is made consistent with the accessible memory cell.
    Type: Grant
    Filed: April 6, 2005
    Date of Patent: January 27, 2009
    Assignee: Sun Microsystems, Inc.
    Inventors: Zhen Wu Liu, Shree Kant, Kenway W. Tam