Patents by Inventor Cris S. Estanislao

Cris S. Estanislao 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 variable power amplifier
    Patent number: 4935705
    Abstract: A high efficiency variable power amplifier suitable for use in a battery powered device is provided wherein a variable power amplifier has at least a first (2) and a second (12) amplification stage. Base bias potential (8) for the second amplification stage (12) is derived from the bias potential provided to the first amplification stage. In this way, as the bias potential to the first amplification stage is modified to vary the output power, the base bias potential for the second amplification stage is correspondingly modified to maintain the amplifier's efficiency.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: June 19, 1990
    Assignee: Motorola, Inc.
    Inventors: Cris S. Estanislao, Ole Hammer