Patent ID: 8064777

Claim:
A circuit comprising: a signal distortion generator circuit configured to generate distortion vectors in any of four distortion vector quadrants, the distortion generator comprising: an RF splitter adapted to split an RF input signal into positive and negative outputs; a first diode current shunt between the positive output of the RF splitter and ground; a second diode current shunt between the negative output of the RF splitter and ground; a first varactor current Shunt between the positive output of the RF splitter and ground; and a second varactor current shunt between the negative output of the RF splitter and ground; wherein the first diode current shunt is configured to produce a positive real component of an RF predistortion signal, the second diode current shunt is configured to produce a negative real component of an RF predistortion signal, the first varactor current shunt is configured to produce a positive imaginary component of an RF predistortion signal, and the second varactor current shunt is configured to produce a negative imaginary component of an RF predistortion signal.