Patent ID: 6538509
Filing Date: 2003-03-25
Classification: H03F

Abstract:
A predistortion linearizer comprising:a signal separator for receiving an input signal and for dividing the signal into a first signal and a second signal, a first path for carrying said first signal, a second path for carrying said second signal, a signal combiner for combining the signals from the first and second paths, a non-linear device in said second path between said signal separator and said signal combiner for receiving said second signal and generating distortion therefrom, and a vector modulator in one of said first and second paths between said signal separator and said signal combiner for controlling at least one of the amplitude and phase of the signal carried by the respective path, said vector modulator comprising a second signal separator for dividing said signal carried by said respective path into a first modulator signal and a second modulator signal, a first modulator path for carrying said first modulator signal, a second modulator path for carrying said second modulator signal, and a second signal combiner for combining the first and second modulator signals received from the first and second modulator paths, said vector modulator including means for producing a phase difference between said first modulator signal and said second modulator signal, and wherein said first modulator path includes amplitude controlling means for controlling the amplitude of said first modulator signal, and said second modulator path includes amplitude controlling means for controlling the amplitude of said second modulator signal.