Patents by Inventor Joao P. C. C. Vital

Joao P. C. C. Vital 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).

  • Digital-to-analog converter using switched capacitor and transverse filter
    Patent number: 5008674
    Abstract: The converter incorporates a transversal filter. The filter delays are implemented in digital form prior to conversion into analog signals (preferably using switched capacitor techniques). One form of switched capacitor converter (with or without filtering) employs a single capacitor, common to a plurality of bits, appropriate weighting of the bits being achieved by controlling the switching.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: April 16, 1991
    Assignee: British Telecommunications
    Inventors: Jose D. A. E. Da Franca, Joao P. C. C. Vital, Carlos M. D. A. D. A. Leme