Patents by Inventor David Lewsey

David Lewsey 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).

  • Linear amplifier arrangement
    Patent number: 6512417
    Abstract: An amplifier arrangement comprising an amplifier for amplifying an input radio frequency (RF) signal to generate an output RF signal. A linear function processor generates a linear function correction signal which is a linear function of previous samples of the input signal in order to compensate for distortion effects of the amplifier related to the history of the input signal. A non-linear function processor generates a non-linear function of the input signal in order to compensate for instantaneous distortion effects of the amplifier. Then a pre-distortion processor distorts the current input signal in accordance with the linear and nonlinear function correction signals in order to compensate for both types of distortion in the output signal.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: January 28, 2003
    Assignee: Nortel Networks Limited
    Inventors: Andrew Booth, Howard Smith, David Lewsey, Scott Widdowson
  • Linear amplifier arrangement
    Publication number: 20020041210
    Abstract: An amplifier arrangement comprising an amplifier for amplifying an input radio frequency (RF) signal to generate an output RF signal. A linear function processor generates a linear function correction signal which is a linear function of previous samples of the input signal in order to compensate for distortion effects of the amplifier related to the history of the input signal. A non-linear function processor generates a non-linear function of the input signal in order to compensate for instantaneous distortion effects of the amplifier. Then a pre-distortion processor distorts the current input signal in accordance with the linear and non-linear function correction signals in order to compensate for both types of distortion in the output signal.
    Type: Application
    Filed: May 11, 2001
    Publication date: April 11, 2002
    Inventors: Andrew Booth, Howard Smith, David Lewsey, Scott Widdowson