Patents by Inventor Colin S. Phan

Colin S. Phan 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 multiplexer and variable gain amplifier for intermediate frequency applications
    Patent number: 7106232
    Abstract: A diversity receiver circuit system (10) including a primary channel (20) and a diversity channel (22), where analog input signals are converted to differential signals in both channels (20, 22). The receiver circuit system (10) includes a multiplexer (14) and a variable gain amplifier (12) formed on a single RF integrated circuit chip (16), where the multiplexer (14) is positioned before the amplifier (12). The differential signals in the primary channel (20) and the diversity channel (22) are applied to an amplified path (72, 78) and a non-amplified path (76, 82) in the multiplexer (14). A control signal selects one of the amplified primary channel signal, the non-amplified primary channel signal, the amplified diversity channel signal or the non-amplified diversity channel signal.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: September 12, 2006
    Assignee: Northrop Grumman Corporation
    Inventors: Harry S. Harberts, David L. Gannon, Robert E. Johnston, William R. Goyette, Colin S. Phan
  • Analog multiplexer and variable gain amplifier for intermediate frequency applications
    Publication number: 20030185250
    Abstract: A diversity receiver circuit system (10) including a primary channel (20) and a diversity channel (22), where analog input signals are converted to differential signals in both channels (20, 22). The receiver circuit system (10) includes a multiplexer (14) and a variable gain amplifier (12) formed on a single RF integrated circuit chip (16), where the multiplexer (14) is positioned before the amplifier (12). The differential signals in the primary channel (20) and the diversity channel (22) are applied to an amplified path (72, 78) and a non-amplified path (76, 82) in the multiplexer (14). A control signal selects one of the amplified primary channel signal, the non-amplified primary channel signal, the amplified diversity channel signal or the non-amplified diversity channel signal.
    Type: Application
    Filed: April 2, 2002
    Publication date: October 2, 2003
    Inventors: Harry S. Harberts, David L. Gannon, Robert E. Johnston, William R. Goyette, Colin S. Phan