Patents by Inventor J. P. R. Michel Pigeon

J. P. R. Michel Pigeon 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).

  • Phase error detector for a phase locked loop
    Patent number: 5436938
    Abstract: A phase lock loop (PLL) arrangement includes a voltage controlled ring oscillator (VCRO) including delay elements whose delay is controlled by a control voltage produced by the PLL. A phase error detector is provided which compares pulses of a PLL feedback frequency with pulses of a delayed reference signal, the delay being provided by further delay elements controlled by the same control voltage. The phase error detector produces an output signal which indicates when phase error exceeds a predetermined tolerance, and also indicates an absence of frequency lock.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: July 25, 1995
    Assignee: Northern Telecom Limited
    Inventor: J. P. R. Michel Pigeon