Active distortion signal generating circuit for a line-distortion type power amplifier

A method for generating a distortion signal, comprising:

• dividing an input signal into a linear path signal and a nonlinear path signal;
• processing the linear path signal to output a linear signal;
• processing the nonlinear path signal to output a distortion signal;
• combining the linear signal and the distortion signal through a branchline coupler to obtain a first sum signal, and outputting the first sum signal through two terminals of the branchline coupler;
• adding the outputs from said two terminals of the branchline coupler through a combiner and outputting a second sum signal;
• generating control signals utilizing the linear signal, the distortion signal, the first sum signal and the second sum signal;
• and
• adjusting the distortion signal based upon said control signals.

An active distortion signal generating circuit, comprising:

• a dividing circuit for dividing an input signal into a linear path signal and a nonlinear path signal;
• a linear processing circuit for linearly processing the linear path signal and outputting a linear signal;
• a nonlinear processing circuit for nonlinearly processing the nonlinear path signal and outputting a distortion signal;
• a first adding circuit for adding the linear signal and the distortion signal to obtain a first sum signal, said first adding circuit outputting the first sum signal through two terminals;
• a second adding circuit for adding the outputs from said two terminals of the first adding circuit and outputting a second sum signal;
• a generating circuit for generating control signals utilizing the linear signal, the distortion signal, the first sum signal and the second sum signal, said generating circuit outputting the control signals;
• and
• an adjusting circuit for adjusting the distortion signal based upon the control signals.

An active distortion signal generating circuit, comprising:

• linear processing means for receiving a linear path signal and outputting a linear signal;
• nonlinear processing means for receiving a nonlinear path signal and outputting a distortion signal;
• output means for adding the linear signal and the distortion signal to obtain a first sum signal, adding the first sum signal to a duplicate first sum signal to obtain a second sum signal, and for generating control signals utilizing the linear signal, the distortion signal, the first sum signal and the second sum signal;
• and
• variable attenuator and phase shifter means for adjusting the distortion signal based upon the control signals.