Patents by Inventor James Everitt

James Everitt 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).

  • Matrix element voltage sensing for precharge
    Patent number: 6594606
    Abstract: A method and apparatus to calibrate an LED matrix display such that a driver will provide a proper precharge voltage to LED elements within the display during a scan period. A current is driven through a calibration element, and a voltage reflecting the steady-state element voltage is measured and stored as a calibration value. A processor controls whether to precharge during the calibration cycle, and determines when the calibration cycle is completed. During subsequent normal scans, a driver applies a voltage based on the stored calibration value to rapidly precharge parasitic capacitance associated with a display element to a proper value, and also drives a selected current through the device.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: July 15, 2003
    Assignee: Clare Micronix Integrated Systems, Inc.
    Inventor: James Everitt
  • Emulating narrow band phase-locked loop behavior on a wide band phase-locked loop
    Patent number: 6577695
    Abstract: A phase-locked loop circuit for providing a tightly controlled capture range for locking an output signal to a data signal, while also providing a wide frequency capture range for initially pulling the output signal within this narrow, predetermined frequency range. The apparatus detects a frequency difference between at least one reference signal and an output signal, and generates a frequency error signal in response to the frequency difference. A phase difference is detected between a received input signal and the output signal, and a phase error signal is generated in response to the phase difference. The frequency error signal and the phase error signal are combined to control the frequency of the output signal by controlling an input-controlled oscillator.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: June 10, 2003
    Assignee: Level One Communications
    Inventors: James Everitt, James Parker
  • Matrix element voltage sensing for precharge
    Publication number: 20020169575
    Abstract: A method and apparatus to calibrate an LED matrix display such that a driver will provide a proper precharge voltage to LED elements within the display during a scan period. A current is driven through a calibration element, and a voltage reflecting the steady-state element voltage is measured and stored as a calibration value. A processor controls whether to precharge during the calibration cycle, and determines when the calibration cycle is completed. During subsequent normal scans, a driver applies a voltage based on the stored calibration value to rapidly precharge parasitic capacitance associated with a display element to a proper value, and also drives a selected current through the device.
    Type: Application
    Filed: May 9, 2001
    Publication date: November 14, 2002
    Inventor: James Everitt