Patents by Inventor Hongjia Mo

Hongjia Mo 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).

  • Nested cascaded mixed-radix digital delta-sigma modulator
    Patent number: 10560111
    Abstract: A nested mixed-radix DDSM can guarantee zero systematic frequency error when used as a divider controller in a fractional-N frequency synthesizer is described. This disclosure presents a nested cascaded mixed-radix DDSM architecture which can also guarantee zero systematic frequency error. In addition, the disclosure allows one to use higher order auxiliary modulators and shaped dither signal to eliminate feedthrough spurs completely. By increasing the number of levels in the cascade, the moduli of the individual modulator stages can be reduced, thereby increasing the speed of the synthesizer.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: February 11, 2020
    Assignee: University College Cork-National University of Ireland, Cork
    Inventors: Hongjia Mo, Michael Peter Kennedy
  • Apparatus for reducing wandering spurs in a fractional-N frequency synthesizer
    Patent number: 10541707
    Abstract: The present invention provides a fractional-N frequency synthesizer comprising a divider controller comprising a multistage noise Shaping (MASH) digital delta-sigma modulator comprising L stages, wherein the Lth stage is configured to receive as an input a high amplitude dither signal.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: January 21, 2020
    Assignee: UNIVERSITY COLLEGE CORK, NUI, CORK
    Inventors: Hongjia Mo, Michael Peter Kennedy
  • APPARATUS FOR REDUCING WANDERING SPURS IN A FRACTIONAL-N FREQUENCY SYNTHESIZER
    Publication number: 20190089368
    Abstract: The present invention provides a fractional-N frequency synthesizer comprising a divider controller comprising a multistage noise Shaping (MASH) digital delta-sigma modulator comprising L stages, wherein the Lth stage is configured to receive as an input a high amplitude dither signal.
    Type: Application
    Filed: July 20, 2018
    Publication date: March 21, 2019
    Inventors: Hongjia Mo, Michael Peter Kennedy
  • NESTED CASCADED MIXED-RADIX DIGITAL DELTA-SIGMA MODULATOR
    Publication number: 20190068207
    Abstract: A nested mixed-radix DDSM can guarantee zero systematic frequency error when used as a divider controller in a fractional-N frequency synthesizer is described. This disclosure presents a nested cascaded mixed-radix DDSM architecture which can also guarantee zero systematic frequency error. In addition, the disclosure allows one to use higher order auxiliary modulators and shaped dither signal to eliminate feedthrough spurs completely. By increasing the number of levels in the cascade, the moduli of the individual modulator stages can be reduced, thereby increasing the speed of the synthesizer.
    Type: Application
    Filed: August 30, 2018
    Publication date: February 28, 2019
    Inventors: Hongjia Mo, Michael Peter Kennedy