Patents by Inventor John C. Schief

John C. Schief 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).

  • Slew rate control for driver circuit
    Patent number: 7521968
    Abstract: The slew rate of signals output from an integrated circuit is selectively controlled to optimize the quality of the output data signal depending upon whether the communication channels require a faster or slower slew rate. Faster slew rates may be utilized when the communication channels are prone to attenuation, while slower slew rates may be implemented in the communication channels when crosstalk is more of a concern.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: April 21, 2009
    Assignee: International Business Machines Corporation
    Inventors: Daniel M. Dreps, John C. Schief, Glen A. Wiedemeier, Joel D. Ziegelbein