Patents by Inventor Arthur Edwards

Arthur Edwards 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).

  • Floating output digital to analog converter
    Patent number: 4961045
    Abstract: A digital to analog converter circuit produces an output voltage which includes a small error voltage floating on a larger direct current voltage component. The circuit includes a controlled current supply coupled to the emitter of an NPN transistor to which the direct current voltage component is supplied to the base thereof. The error voltage is generated by modulating the current through the transistor by controlling the current supply, independent of the voltage component supplied to its base, such that the output voltage occurring at the emitter of the transistor is a function of the difference between the direct current component and the natural log of the modulated emitter current.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: October 2, 1990
    Assignee: Motorola, Inc.
    Inventors: Randall C. Gray, Arthur Edwards