Patents by Inventor James John Caserta

James John Caserta 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).

  • Method and apparatus for a calibrated frequency modulation phase locked loop
    Patent number: 6229400
    Abstract: In accordance with the present invention, a frequency modulating phase-locked-loop (FMPLL) (100) architecture is implemented. The frequency of the FMPLL (100) is controlled using a current controlled oscillator (ICO) (126). The ICO (126) receives a current signal incorporating feedback to maintain a fixed gain. The ICO (126) associated with the FMPLL (100) establishes a predictable change in the output frequency for a given change in its input controlled current (ICTL). Relying upon this fixed gain, a frequency shift can be created by summing in an additional delta current (IMOD) to the input control current. By periodically varying the magnitude of the current IMOD, a frequency modulated clock is produced at the output of the ICO 126. The magnitude of IMOD controls the amount of frequency shift of the frequency modulated clock. By providing an IMOD signal which is proportional to the generated system frequency, a frequency shift proportional to the average, or center, frequency is produced.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: May 8, 2001
    Assignee: Motorola Inc.
    Inventors: Kelvin E. McCollough, James John Caserta