Patents by Inventor Dan E. Lewis

Dan E. Lewis 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: 4636773
    Abstract: A digital-to-analog converter system for converting a digital input signal having parallel words, each word including multi-bit groups of weighted significance, and which is provided at an input word rate of W Hz, is disclosed. The digital-to-analog converter system (10, 100, 200) includes pulse generating circuitry (11, 13, 111, 113, 211, 213) responsive to a first multi-bit group and a second multi-bit group of the digital input words for providing (a) a first pulse modulated signal as a function of the value of the first multi-bit group and (b) a second pulse modulated signal as a function of the value of the second multi-bit group; weighting elements (15, 19, 115, 119, 215, 219) for weighting the first and second pulse modulated signals as a function of the relative weighted significance of the first and second multi-bit groups; and output circuitry (20, 120, 220) for summing and filtering the weighted signals to provide an analog output signal that is representative of the digital input signal.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: January 13, 1987
    Assignee: Hughes Aircraft Company
    Inventors: Dan E. Lewis, James L. Gundersen