Patents by Inventor Walter A. Svarczkopf

Walter A. Svarczkopf 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).

  • Method and apparatus for detecting faults in differential current switching logic circuits
    Patent number: 4967151
    Abstract: A circuit for testing a differential current switching logic circuit of the type including: a bias potential, two resistors connected to the bias potential, and apparatus responsive to an input signal for sinking a first current through a selected one of the resistors so as to generate first and second differential output signals at the resistors. The circuit includes first, second, and third transistors, each having first and second terminals for conducting a current responsive to a signal applied to a control terminal. Apparatus are provided for supplying a current. The first transistor has its first terminal connected to the current supplying means, and its second terminal connected to a circuit node. The second transistor has its first terminal connected to the circuit node, its second terminal connected to the bias potential, and its control terminal connected to sense the potential at a selected one of the resistors.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: October 30, 1990
    Assignee: International Business Machines Corporation
    Inventors: Arnold E. Barish, David A. Kiesling, Mark D. Mayo, Walter A. Svarczkopf