Patents by Inventor John Willard Brickell

John Willard Brickell 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: 5898454
    Abstract: A multi-output distribution amplifier includes a forward amplifier and a reverse amplifier and multiple outputs. The forward and reverse paths are separated utilizing low and high pass filters. The geometric mean frequency between the respective pass bands of the high and low pass filters is known as the crossover frequency. A circuit for providing a 180 degree phase reversal such as a balun transformer is connected in series with one (in a dual output arrangement) or half the reverse paths of an arrangement involving three or more forward or reverse paths to improve crossover isolation. For example, in a typical dual output distribution arrangement where the amplifiers are not padded, close to 20 dB of crossover isolation improvement is accomplished by simply connecting a balun transformer in series with one or the other of the low pass filters connected to one or the other forward direction output. At a minimum, a 6 dB improvement can be achieved.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: April 27, 1999
    Assignee: Scientific-Atlanta, Inc.
    Inventor: John Willard Brickell