Patents by Inventor Katherine T. Hoang

Katherine T. Hoang 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).

  • PON burst mode receiver with fast decision threshold setting
    Patent number: 7920798
    Abstract: A receiver converts an analog signal, derived from light pulses in a GPON fiber optic system, to clean digital electrical signals. A photodetector and transimpedance amplifier (TIA) convert the light pulses to analog electrical signals. A reset signal generated by a media access controller (MAC) in the GPON system signifies the start of a new burst of data. The receiver has a switchable low pass filter that establishes the threshold voltage for determining whether the analog signal is a logical 1 or a logical 0. At the very start of a new burst, the low pass filter has a fast time constant to quickly establish the threshold voltage for the burst. At a later time during the burst, the low pass filter is switched to have a slow time constant to create a relatively stable threshold voltage.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: April 5, 2011
    Assignee: Micrel, Inc.
    Inventors: Thomas S. Wong, Katherine T. Hoang
  • PON Burst Mode Receiver with Fast Decision Threshold Setting
    Publication number: 20080310861
    Abstract: A receiver converts an analog signal, derived from light pulses in a GPON fiber optic system, to clean digital electrical signals. A photodetector and transimpedance amplifier (TIA) convert the light pulses to analog electrical signals. A reset signal generated by a media access controller (MAC) in the GPON system signifies the start of a new burst of data. The receiver has a switchable low pass filter that establishes the threshold voltage for determining whether the analog signal is a logical 1 or a logical 0. At the very start of a new burst, the low pass filter has a fast time constant to quickly establish the threshold voltage for the burst. At a later time during the burst, the low pass filter is switched to have a slow time constant to create a relatively stable threshold voltage.
    Type: Application
    Filed: June 18, 2007
    Publication date: December 18, 2008
    Applicant: MICREL, INC.
    Inventors: Thomas S. Wong, Katherine T. Hoang