Patents by Inventor Allan Podell

Allan Podell 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: 4752743
    Abstract: The input signal to a TWT amplifier is predistorted in amplitude and phase to the inverse of the amplifier transfer characteristic by an adjustable circuit including a phase linearizing section and an amplitude linearizing section, both in series with the input signal and amplifier. Each section includes two pairs of back-to-front Schottky diodes. Preferably an additional diode is in series with one pair for the amplitude section. The diodes of each pair are of like polarity and opposite to the diodes of the other pair of the section. Additional diodes are connected between the pair junctions and ground, and adjustable D.C. bias fed into these junctions. Additional resistors and capacitors bridge the pairs, and are arranged into a phase delay network in one of the sections.
    Type: Grant
    Filed: September 26, 1986
    Date of Patent: June 21, 1988
    Assignee: Varian Associates, Inc.
    Inventors: David Pham, Allan Podell, John A. Steck