Patents by Inventor Chian C. Ho

Chian C. Ho 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).

  • Patent number: 6275177
    Abstract: A local nonlinear feedback loop (LNFL) technique and a sigma-delta modulator (SDM) for promoting highly stable oversampling using the LNFL technique. Not only can gain mismatch of the sigma-delta modulator be minimized, but the overload of the later stage sigma-delta modulator can also be resolved without sacrificing the signal noise ratios (SNR) of the overall system. Moreover, using the local nonlinear feedback loop technique of this invention attenuates the voltage signal of the sigma-delta modulator, therefore decreasing the power consumption of the overall sigma-delta modulator system.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: August 14, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: Chian C. Ho, Hsun-Chang Hsieh, Chung J. Kuo
  • Patent number: 5870048
    Abstract: Based on the recently developed MASH (multistage noise shaping) architecture, an improved architecture--uni-MASH which employs the time-division concept for architecture and circuit reuse is proposed. An oversampling sigma-delta modulator having uni-MASH architecture uses a single stage of time- and capacitor-integrator in lieu of multiple stages of integrators, digital-to-analog converters and quantizers used in the MASH architecture. Uni-MASH retains robust stability and high-ordered noise shaping factor of MASH's virtues.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: February 9, 1999
    Assignee: National Science Council
    Inventors: Chung J. Kuo, Chian C. Ho