Patents by Inventor Stephen D. Nemetz

Stephen D. Nemetz 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-locked loop having improved locking times and a method of operation therefore
    Patent number: 5959478
    Abstract: An electronic device is delineated comprising, in combination, a Phased Lock Loop (PLL) having a charge pump, and a mixed signal circuit coupled in parallel to the charge pump. The mixed signal circuit includes analog circuitry for adding charge to and removing charge from capacitors in a Low Pass Filer (LPF) of the PLL. The mixed signal circuit also includes digital circuitry for controlling the initiation and termination of both the charging and discharging operations carried on by the analog portion of the mixed signal circuit. Upon a significant change in system frequency, the mixed signal circuit first fully discharges and then rapidly charges the capacitors in the LPF in a manner which results in a significant reduction in PLL locking time.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: September 28, 1999
    Assignee: VLSI Technology, Inc.
    Inventors: John Charles Ciccone, Stephen D. Nemetz