Patents Assigned to The United States of America as represented by the Administrator of the Administration National Aeronautics and Space
  • Differential current source
    Patent number: 5021729
    Abstract: A differential, voltage-controlled current source, employing operational amplifiers as the active elements, provides an essentially symmetrical, differential, high impedance drive to a load, the drive being isolated from any circuit common or system ground. Because of the "floating" differential drive and the identical source impedances of the two outputs, errors from common mode voltages are eliminated.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: June 4, 1991
    Assignee: The United States of America as represented by the Administrator of the Administration National Aeronautics and Space
    Inventor: John F. Sutton