Patents by Inventor Brendan P Fenney

Brendan P Fenney 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).

  • Frequency tracking arrangements
    Patent number: 6114902
    Abstract: A frequency tracking arrangement in which a frequency tracking circuit utilizes a continuously variable analogue first order all-pass filter circuit as a controllable phase-shift element in a closed-loop system which produces a control signal to control the phase shift circuit to introduce a 90.degree. phase shift of a received reference frequency signal when the circuit is tracking that reference frequency. The control signal may then be utilized to slave the cut-off frequency of a filter and/or the delay time introduced by a delay line.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: September 5, 2000
    Assignee: Mitel Semiconductor Limited
    Inventors: Trevor P Beatson, Nicholas Mihailovits, Brendan P Fenney, David I Boddy