Patents by Inventor Guang Fei Zhang

Guang Fei Zhang 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).

  • Wideband power amplifier linearization technique
    Patent number: 6744314
    Abstract: A novel linearization apparatus for reducing power amplifier distortion does not require delay lines. The apparatus includes a power amplifier and an error generator. The signals provided by the error generator (error signal) and the power amplifier are combined to subtract out the distortion introduced by the power amplifier. The error generator includes two auxiliary amplifiers, wherein one of the auxiliary amplifiers is operated in it saturated region and the other is operated in its non-saturated region. The power amplifier and the two auxiliary amplifiers have the same distortion characteristics and receive the same input signal. The auxiliary amplifier operating in its saturated region introduces distortion and the auxiliary amplifier operating in its non-saturated region does not introduce distortion. The two signals provided by the auxiliary amplifiers are combined to produce an error signal having a distortion component that is an approximate replica of the power amplifier distortion.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: June 1, 2004
    Assignee: Harris Corporation
    Inventors: Guang Fei Zhang, Xing Wang, Fabio Concilio, Tjo San Jao
  • Wideband power amplifier linearization technique
    Publication number: 20030234687
    Abstract: A novel linearization apparatus for reducing power amplifier distortion does not require delay lines. The apparatus includes a power amplifier and an error generator. The signals provided by the error generator (error signal) and the power amplifier are combined to subtract out the distortion introduced by the power amplifier. The error generator includes two auxiliary amplifiers, wherein one of the auxiliary amplifiers is operated in it saturated region and the other is operated in its non-saturated region. The power amplifier and the two auxiliary amplifiers have the same distortion characteristics and receive the same input signal. The auxiliary amplifier operating in its saturated region introduces distortion and the auxiliary amplifier operating in its non-saturated region does not introduce distortion. The two signals provided by the auxiliary amplifiers are combined to produce an error signal having a distortion component that is an approximate replica of the power amplifier distortion.
    Type: Application
    Filed: June 20, 2002
    Publication date: December 25, 2003
    Inventors: Guang Fei Zhang, Xing Wang, Fabio Concilio, Tjo San Jao