Patents by Inventor Anne M. Pearce

Anne M. Pearce 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 locked-loop using a microcontroller as a comparator
    Patent number: 5705955
    Abstract: A frequency-locked loop (100) employs a controllable oscillator (102) for generating an output signal having a frequency, optional sampler (104), coupled to oscillator (102), for sampling the frequency of the output signal, a divider (106), coupled to optional sampling circuit (104), for dividing the output signal frequency to generate a prescaled signal and a microprocessor (108), coupled between the divider 106 and oscillator (102), for comparing the prescaled signal to a reference signal and generating a control signal for correcting frequency shifts based upon the comparison. The control signal generated by microprocessor (108) is non-continuous. During that time when microprocessor (108) generates no control signals, power is removed from various frequency-locked loop circuitry.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: January 6, 1998
    Assignee: Motorola, Inc.
    Inventors: Thomas A. Freeburg, John Ley, Anne M. Pearce, Gary Schulz, Paul Odlyzko