Patents by Inventor Geoffrey D. Sizer

Geoffrey D. Sizer 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).

  • Self-calibrating temperature-compensated frequency source
    Patent number: 5172075
    Abstract: A frequency source (1) in, for example, a remote unit in a mobile communications system, is controlled to maintain a stable frequency signal. In normal operation, the frequency source (1) is frequency locked to an external reference frequency (10). A temperature detecting device (2) monitors the temperature of the frequency source, and information relating to temperature is stored in a storage device (7) together with information relating to control signals (6) applied to the frequency source (1). In the absence of the reference frequency (10), the temperature of the frequency source (1) is detected and the stored information is used to generate a control signal (6) to control the output frequency of the frequency source (1) in accordance with the detected temperature.
    Type: Grant
    Filed: February 21, 1992
    Date of Patent: December 15, 1992
    Assignee: Advanced Systems Research Pty. Limited
    Inventors: Michael J. Yerbury, Geoffrey D. Sizer