Patents by Inventor Robert Jonathan Annett

Robert Jonathan Annett 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).

  • Radio transmitters and methods of operation
    Patent number: 5745526
    Abstract: A radio transmitter has a digital modulator 10 which modulates an incoming coded signal according to .pi./4 DQPSK modulation. A signal 30 representative of the amplitude of the modulated signal is applied to a bias modulator 27 to modulate the magnitude of a bias voltage 26. The modulated bias voltage 26 is applied to a power amplifier 24 of the transmitter in order to improve the apparent linearity and adjacent channel performance of the power amplifier.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: April 28, 1998
    Assignee: Nokia Mobile Phones Limited
    Inventors: Arne Lennart Kumm, Robert Jonathan Annett