Patents by Inventor Stephen Charles Wilkinson-Gruber

Stephen Charles Wilkinson-Gruber 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).

  • High-speed fully-compensated low-voltage differential driver/translator circuit arrangement
    Patent number: 6297685
    Abstract: An output buffer provides a stable, predetermined low voltage differential over power supply, temperature, and process variations yet has a high speed of operation. More particularly, a data path of an output buffer includes an emitter-coupled differential amplifier followed by an output section of two level-shifting emitter followers. A predetermined operating current biases the differential amplifier for unsaturated operation and a reference current biases the output section for unsaturated operation. The data path remains unencumbered by compensation circuitry to preserve high speed operation. Instead, a voltage compensator biases the differential amplifier to compensate, at least in part, for variations in a supply voltage. In addition, a variable biasing current to the voltage compensator with a predetermined temperature coefficient may further temperature compensate the differential amplifier.
    Type: Grant
    Filed: June 14, 2000
    Date of Patent: October 2, 2001
    Assignee: International Business Machines Corporation
    Inventors: John Farley Ewen, Stephen Charles Wilkinson-Gruber