Patent ID: 6211734
Filing Date: 2001-04-03
Classification: H03F

Abstract:
An active distortion signal generating circuit, comprising:a divider that divides an input signal into a linear path signal and a non linear path signal;a linear processor that receives the linear path signal and outputs a linear signal;a nonlinear processor that receives the nonlinear path signal and outputs a distortion signal;a branchline coupler that adds the linear signal and the distortion signal to obtain a first sum signal, said branchline coupler outputting the first sum signal through two terminals;a combiner that adds the outputs from said two terminals of the branchline coupler and outputs a second sum signal;a control signal generating unit that generates control signals utilizing the linear signal, the distortion signal, the first sum signal and the second sum signal, said control signal generating unit outputting the control signals; anda variable attenuator and a variable phase shifter that adjusts the distortion signal based upon the control signals.