Patents by Inventor Robert B. Hallgren

Robert B. Hallgren 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).

  • Electronic sampler switch
    Patent number: 4639619
    Abstract: A low distortion differential sampler circuit implemented in GaAs is provided. The sampler circuit constitutes an on/off switching circuit rather than a sample and hold circuit. Elimination of the holding capacitor results in shorter switching times and reduced error. The sampler implements a differential, balanced architecture which compensates for clock signal feed through. The sampler circuit includes a three-stage, AC coupled GaAs pre-amplifier which provides a complementary clock signal to drive the sampler and sets the DC levels.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: January 27, 1987
    Assignee: Hewlett-Packard Company
    Inventors: Gary Baldwin, Robert B. Hallgren, Thomas Hornak, Fred H. Ives