Patents by Inventor Walter L. Gregory, Jr.

Walter L. Gregory, Jr. 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).

  • Patent number: 5262716
    Abstract: A system and method for calibrating testers. A reference timing signal and an internal timing signal used in tester calibration are generated within a tester. A first calibration is performed wherein test module channel characteristics are measured and recorded, and an adjustment value is determined to correct the time placement of the internal timing signal. Driver and receiver delays are adjusted based on the characteristics measured in this first calibration, and the internal timing signal is adjusted as well. A second calibration is performed wherein temporal relationships between the adjusted internal timing signal and signals at the test module channel mint pins are determined. Driver and receiver delays are adjusted based on the results of this calibration. An optional calibration is performed wherein temporal relationship between the adjusted internal timing signal and signals at the board-interface end of a test fixture are measured.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: November 16, 1993
    Assignee: Hewlett-Packard Company
    Inventors: Walter L. Gregory, Jr., Jay M. Stepleton, Davis M. Glasgow, Kay C. Lannen
  • Patent number: 4596940
    Abstract: A three state Emitter Coupled Logic (ECL) differential bus driver is capable of driving a multiply driven balanced ECL bus which is isolated from a supply voltage V.sub.EE and therefore provides isolation from ground loops, higher performance, lower cost, lower noise, reduced electromagnetic radiation and reduced sensitivity to ground voltage variations.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: June 24, 1986
    Assignee: Hewlett-Packard Company
    Inventors: W. Alan Schuppan, Walter L. Gregory, Jr.