Patents by Inventor Ka Wai Tong

Ka Wai Tong 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).

  • Low jitter high phase resolution PLL-based timing recovery system
    Patent number: 7636007
    Abstract: A low jitter, high phase resolution phase lock loop incorporating a ring oscillator-type VCO is designed and constructed to operate at a characteristic frequency M times higher than a required output clock frequency. Multi-phase output signals are taken from the VCO and selected through a Gray code MUX, prior to being divided down to the output clock frequency by a divide-by-M frequency divider circuit. Operating the VCO at frequencies in excess of the output clock frequency, allows jitter to be averaged across a timing cycle M and further allows a reduction in the number of output phase taps, by a scale factor M, without reducing the phase resolution or granularity of the output signal.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: December 22, 2009
    Assignee: Broadcom Corporation
    Inventors: Myles Wakayama, Stephen A. Jantzi, Kwang Young Kim, Yee Ling “Felix” Cheung, Ka Wai Tong
  • Low jitter high phase resolution PLL-based timing recovery system
    Patent number: 6791379
    Abstract: A low jitter, high phase resolution phase lock loop incorporating a ring oscillator-type VCO is designed and constructed to operate at a characteristic frequency M times higher than a required output clock frequency. Multi-phase output signals are taken from the VCO and selected through a Gray code MUX, prior to being divided down to the output clock frequency by a divide-by-M frequency divider circuit. Operating the VCO at frequencies in excess of the output clock frequency, allows jitter to be averaged across a timing cycle M and further allows a reduction in the number of output phase taps, by a scale factor M, without reducing the phase resolution or granularity of the output signal.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: September 14, 2004
    Assignee: Broadcom Corporation
    Inventors: Myles Wakayama, Stephen A. Jantzi, Kwang Young Kim, Yee Ling Felix Cheung, Ka Wai Tong