Patents by Inventor Fan Y. Ma

Fan Y. Ma 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).

  • Multi-channel sigma-delta A/D converters with improved throughput
    Patent number: 5617090
    Abstract: A sigma delta convertor 20 has a number of time slots that are programmable connectable to the input channels 200 via a multiplexer 205. Conversion throughput of any one input channel is increased by connecting two or more time slots to the input channel. For an eight input channel embodiment 800 the throughput of conversion of one input can be increased 2.times., 4.times. or 8.times. by connecting, respectively, 2, 4 or all 8 time slots to the selected input channel.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: April 1, 1997
    Assignee: Harris Corporation
    Inventors: Fan Y. Ma, John J. Kornblum
  • Sigma Delta analog to digital converter with three point calibration apparatus and method
    Patent number: 5598157
    Abstract: An analog to digital converter 10 has a switched capacitor analog modulator 12 with three point calibration. Offset calibration applies on offset correction value in OCR 22 to an uncalibrated digital output. Register 28 holds a desired full scale value, register 24 holds a positive full scale value, and register 26 holds a negative full scale value. Depending upon the polarity of the converted analog signal, the offset corrected digital signal is multiplied by a positive or a negative gain correction factor.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: January 28, 1997
    Assignee: Harris Corporation
    Inventors: John J. Kornblum, Carlos A. Ugarte, Fan Y. Ma