Patents by Inventor Gabriel M. Y. Li

Gabriel M. Y. Li 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).

  • Subnanosecond programmable phase shifter for a high frequency digital PLL
    Patent number: 4709170
    Abstract: A circuit for producing a programmable phase shift of clock pulses in response to the data on a group of control lines. The circuit includes a ramp generator stage coupled to drive a comparator stage which has a reference potential input determined by the control line data. The phase shift can be employed to produce a series of subnanosecond delay increments on the clock pulses and is useful in the fine adjustment of a digital phase lock loop.
    Type: Grant
    Filed: November 19, 1986
    Date of Patent: November 24, 1987
    Assignee: National Semiconductor Corp.
    Inventor: Gabriel M. Y. Li
  • Data network driver
    Patent number: 4615039
    Abstract: An improved driver for differentially driving a differentially conducting cable (e.g., for Ethernet) minimizes the output offset signal coupled to the cable when the driver is idle. When driven to an idle state, the driver provides a shaped output which transitions to a quiescent output level in a manner which eliminates output signal common mode step change and consequently reduces signal distortion on the cable due to reflection of the step change.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: September 30, 1986
    Assignee: National Semiconductor Corporation
    Inventors: Gabriel M. Y. Li, Charles P. Carinalli, Ramanatha V. Balakrishnan