Patents by Inventor Reed E. Fisher

Reed E. Fisher 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).

  • High efficiency UHF linear power amplifier
    Patent number: 5105164
    Abstract: An RF amplifier for a phase and envelope varying signal employs a class C operated device for high efficiency. In order to improve the linearity of the class C operated device, a signal corresponding to the envelope of the amplifier output is formed and a portion thereof is fed back to an envelope modulation element such as a pulse width modulator connected to the class C operated device to reduce distortion at the amplifier output.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: April 14, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Reed E. Fisher, Michael J. Koch