Patents by Inventor Hung-Min Jen

Hung-Min Jen 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).

  • Apparatus and method for fingerprint recognition system
    Patent number: 6763127
    Abstract: A fingerprint recognition method includes iterative gamma correction that compensates moisture effect, feature extraction operations, directional morphological filtering that effectively links broken ridges and breaks smeared ridges, adaptive image alignment by local minutia matching, global matching by relaxed rigid transform, and statistical matching with Gaussian weighting functions.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: July 13, 2004
    Assignee: IC Media Corporation
    Inventors: Shang-Hung Lin, Hung-Min Jen
  • Variable gain amplifier
    Patent number: 6737920
    Abstract: The present invention provides a variable gain amplifier with a plurality of gain stages in which each of the gain stages is implemented using a circuit that implements a neutralization approach. This variable gain amplifier provides stable operation characteristics as different gain stages within the variable gain amplifier are turned on and off. This variable gain amplifier also increases linearity across the entire operating range. Additionally, the variable gain amplifier of the present invention provides a constant input impedance through different gain settings. Further, the present invention provides a variable gain amplifier in which each of the various gain stages therein maximize the available voltage swing. Finally, this variable gain amplifier improves common-mode rejection performance and attenuates unwanted harmonics.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: May 18, 2004
    Assignee: Atheros Communications, Inc.
    Inventors: Hung-Min Jen, David K. Su
  • Variable gain amplifier
    Publication number: 20030206062
    Abstract: The present invention provides a variable gain amplifier with a plurality of gain stages in which each of the gain stages is implemented using a circuit that implements a neutralization approach. This variable gain amplifier provides stable operation characteristics as different gain stages within the variable gain amplifier are turned on and off. This variable gain amplifier also increases linearity across the entire operating range. Additionally, the variable gain amplifier of the present invention provides a constant input impedance through different gain settings. Further, the present invention provides a variable gain amplifier in which each of the various gain stages therein maximize the available voltage swing. Finally, this variable gain amplifier improves common-mode rejection performance and attenuates unwanted harmonics.
    Type: Application
    Filed: May 3, 2002
    Publication date: November 6, 2003
    Inventors: Hung-Min Jen, David K. Su