Patents by Inventor Jefferey A. Gleason

Jefferey A. Gleason 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).

  • Adjustable bandwidth differentiating amplifier for a magnetic disk drive
    Patent number: 5157559
    Abstract: A variable bandwidth differentiating amplifier comprises a differential amplifier and a variable filter comprising a capacitor and a pair of diodes. A current source, having a current value derived from the track postion information in the track count register of a disk drive forward biases the diodes to alter the frequency response of the filter. A Gilbert multiplier may also be included to maintain a constant voltage gain for the differential amplifier.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: October 20, 1992
    Assignee: VTC Inc.
    Inventors: Jefferey A. Gleason, David E. Sutliff