Patents by Inventor Raymond E. Barnett

Raymond E. Barnett 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).

  • Active pull-down write driver for three-terminal inductive load
    Patent number: 5532631
    Abstract: A write driver for a magnetic transducer having a three-terminal inductive coil includes first and second voltage sources, a write current source, and a switching network having first and second switching transistors connected between the second voltage source and the respective first and second taps. The switching network responds to respective first and second inputs to switch the write current between respective first and second taps. Active pull-down subcircuits operate to alternately supply base current to the respective first and second switching transistors to charge parasitic capacitances of the respective switching transistors and to alternately sink base current from the respective switching transistors to discharge parasitic capacitances.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: July 2, 1996
    Assignee: VTC Inc.
    Inventors: Tuan V. Ngo, Raymond E. Barnett