Patents by Inventor Joseph C. H. Fung

Joseph C. H. Fung 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).

  • Method and apparatus for a router line card with adaptive selectable gain control
    Patent number: 6285960
    Abstract: A system and method are disclosed for calibrating a line card having a gain control circuit and memory device. The gain control circuit is configured to receive an input signal and an adjustment signal and to output an adjusted output signal that is based on the input signal and the adjustment signal. The gain control circuit also is configured to alter the adjustment signal to a nominal adjustment value so that an adjusted amplitude value of the adjusted signal converges with a nominal amplitude value. A first input signal, a first adjustment signal, and a nominal amplitude value are provided to the gain control circuit. A first nominal adjustment value is determined. The first nominal adjustment value is substantially permanently stored within a first address of the memory device with the first address being associated with the first input signal.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: September 4, 2001
    Assignee: Cisco Technology, Inc.
    Inventors: Joseph C. H. Fung, Mark E. Millet, Charles J. Naegeli, Nan Tu, Guenter Roeck, Yuzon Hao