Patents by Inventor Kari Nummila

Kari Nummila 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).

  • Gain control circuit for a linear power amplifier
    Patent number: 5912588
    Abstract: The invention relates to the gain control of radio amplifiers. In an amplifier circuit according to the invention, the employed output level is a differential pair provided with a tanh.sup.-1 predistorter as a control device. The predistortion is adjusted so that the differential pair operates all the time in the linear region, when the bias current I.sub.E and the transconductance of the pair are changed. By using the amplifier circuit according to the invention, there is achieved linear operation within a wide range of output power.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: June 15, 1999
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Kari Nummila