Patents by Inventor Robert Tapei Yu

Robert Tapei Yu 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: 4004285
    Abstract: A random access memory includes a plurality of one-transistor storage cells. A plurality of sense-write conductors are included, each connected to a plurality of storage cells in a row of storage cells. A plurality of regenerative sense amplifiers are each coupled to two sense-write conductors. A one-transistor dummy storage cell is connected to each sense-write conductor. Read-write circuitry is coupled between a data conductor of the memory chip and a storage node of one of the dummy storage cells of each row of storage cells. The dummy storage cell is selected whenever a storage cell on the opposite side of the regenerative sense amplifier is selected. Charge initially stored in the selected storage cell is redistributed on the opposite sense-write conductor and is subsequently amplified by the sense amplifier, and produced in inverted amplified form at the storage node of the dummy storage cell.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: January 18, 1977
    Assignee: Motorola, Inc.
    Inventors: Alan Richard Bormann, Robert Tapei Yu
  • Patent number: 3942160
    Abstract: A speed-up circuit for a bit sense line of an MOS RAM includes a cross-coupled latch circuit having an output coupled to the bit sense line. When partial discharging of the bit sense line is accomplished through the selected storage cell, the latch circuit switches states and completes discharge of the bit sense line much more rapidly than could have been achieved by the action of the selected storage cell alone. A disabling circuit is connected to the gate of a pull-down MOSFET of the latch circuit connected to the output thereof to turn off the pull-down MOSFET during a write cycle or during the write portion of a read-modify-write cycle. The output of the disabling, or turn-off, circuit operates in response to a signal derived from a clock signal and a chip enable signal applied to the MOS RAM. A bootstrap circuit is provided including a bootstrap charging MOSFET having its gate coupled to V.sub.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: March 2, 1976
    Assignee: Motorola, Inc.
    Inventor: Robert Tapei Yu