Patents by Inventor Michael C. Denny

Michael C. Denny 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).

  • Patent number: 6891438
    Abstract: A power amplifier circuit (10) for a TDMA transmitter. The amplifier circuit (10) includes an FET amplifier (14), a current sensing resistor (24) that senses the quiescent drain current of the FET amplifier (14), and a switch (26) coupled across the sensing resistor (24). When data transmission bursts are being amplified by the amplifier circuit (10), a switch signal closes the switch (26) to bypass the sensing resistor (24) so that it does not dissipate power and reduce the efficiency of the amplifier circuit (10). When the data transmission is between data bursts, the switch signal opens the switch (26) to allow a voltage drop across the sensing resistor (24). The voltage drop is measured to determine the quiescent drain current of the FET amplifier (14) to maintain the drain current at the desirable operating point.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: May 10, 2005
    Assignee: Northrop Grumman Corporation
    Inventors: George T. Arai, Michael C. Denny
  • Publication number: 20040113700
    Abstract: A power amplifier circuit (10) for a TDMA transmitter. The amplifier circuit (10) includes an FET amplifier (14), a current sensing resistor (24) that senses the quiescent drain current of the FET amplifier (14), and a switch (26) coupled across the sensing resistor (24). When data transmission bursts are being amplified by the amplifier circuit (10), a switch signal closes the switch (26) to bypass the sensing resistor (24) so that it does not dissipate power and reduce the efficiency of the amplifier circuit (10). When the data transmission is between data bursts, the switch signal opens the switch (26) to allow a voltage drop across the sensing resistor (24). The voltage drop is measured to determine the quiescent drain current of the FET amplifier (14) to maintain the drain current at the desirable operating point.
    Type: Application
    Filed: December 12, 2002
    Publication date: June 17, 2004
    Inventors: George T. Arai, Michael C. Denny