Patents by Inventor David H. K. Hoe

David H. K. Hoe 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).

  • Analog-to-digital converters using multistage bandpass delta sigma modulators with arbitrary center frequency
    Patent number: 5500645
    Abstract: An architecture for oversampled delta-sigma (.DELTA.--.SIGMA.) analog-to-digital (A/D) conversion of high-frequency, narrow-band signals includes multistage .DELTA.--.SIGMA. modulators that incorporate band-reject noise shaping centered at an arbitrary center frequency F.sub.bp. These modulators cascaded with a bandpass digital filter centered at the arbitrary center frequency F.sub.bp perform A/D conversion for high-frequency, narrow-band signals having the same arbitrary frequency. The bandpass modulators are implemented by use of resonators which provide a substantially large gain at the arbitrary frequency.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: March 19, 1996
    Assignee: General Electric Company
    Inventors: David B. Ribner, David H. K. Hoe
  • Multistage bandpass .DELTA. .SIGMA. modulators and analog-to-digital converters
    Patent number: 5283578
    Abstract: An architecture for oversampled delta-sigma (.DELTA.-.SIGMA.) analog-to-digital (A/D) conversion of high-frequency, narrow-band signals includes multistage .DELTA.-.SIGMA. modulators that incorporate band-reject noise shaping centered at one fourth the clock frequency Fs. These modulators cascaded with a bandpass digital filter also centered at a frequency of Fs/4 perform A/D conversion for high-frequency, narrow-band signals centered at the same frequency. The bandpass modulators are implemented by use of resonators in existing low-pass multistage modulators.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: February 1, 1994
    Assignee: General Electric Company
    Inventors: David B. Ribner, David H. K. Hoe