Patents by Inventor Michael Tak-Kei Ching

Michael Tak-Kei Ching 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).

  • Charge compensation control circuit and method for use with output driver
    Patent number: 6342800
    Abstract: An output driver has an output multiplexor and an output current driver. The output multiplexor receives a data signal and outputs a q-node signal. The output current driver receives the q-node signal and drives a bus based on the q-node signal. The output multiplexor processes the data signal in various ways to generate the q-node signal. The output current driver is responsive to current control bits to select a amount of output drive current. In addition, the output multiplexor is controlled such that the output impedance of the output current driver is maintained within a predetermined range.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: January 29, 2002
    Assignee: Rambus Inc.
    Inventors: Donald C. Stark, Jun Kim, Kurt T. Knorpp, Michael Tak-Kei Ching, Natsuki Kushiyama
  • Current control technique
    Patent number: 6294934
    Abstract: An output driver circuit and current control technique to facilitate high-speed buses with low noise is used to interface with high-speed dynamic RAMs (DRAMs). The architecture includes the following components: an input isolation block (120), an analog voltage divider (104), an input comparator (125), a sampling latch (130), a current control counter (115), and a bitwise output driver (output driver A 107 and output driver B 111).
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: September 25, 2001
    Assignee: Rambus Inc.
    Inventors: Billy Wayne Garrett, Jr., John B. Dillon, Michael Tak-Kei Ching, William F. Stonecypher, Andy Peng-Pui Chan, Matthew M. Griffin
  • Impedance controlled output driver
    Patent number: 6163178
    Abstract: An output driver has an output multiplexor and an output current driver. The output multiplexor receives a data signal and outputs a q-node signal. The output current driver receives the q-node signal and drives a bus based on the q-node signal. The output multiplexor processes the data signal in various ways to generate the q-node signal. The output current driver is responsive to current control bits to select a amount of output drive current. In addition, the output multiplexor is controlled such that the output impedance of the output current driver is maintained within a predetermined range.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: December 19, 2000
    Assignee: Rambus Incorporated
    Inventors: Donald C. Stark, Jun Kim, Kurt T. Knorpp, Michael Tak-Kei Ching, Natsuki Kushiyama
  • Current control technique
    Patent number: 6094075
    Abstract: An output driver circuit and current control technique to facilitate high-speed buses with low noise is used to interface with high-speed dynamic RAMs (DRAMs). The architecture includes the following components: an input isolation block (120), an analog voltage divider (104), an input comparator (125), a sampling latch (130), a current control counter (115), and a bitwise output driver (output driver A 107 and output driver B 111).
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: July 25, 2000
    Assignee: Rambus Incorporated
    Inventors: Billy Wayne Garrett, Jr., John B. Dillon, deceased, Michael Tak-Kei Ching, William F. Stonecypher, Andy Peng-Pui Chan, Matthew M. Griffin