Patent ID: 8063701

Claim:
A system for reducing third harmonic distortion, the system comprising: an amplifier circuit having an amplifier transistor such that the amplifier circuit is capable of exhibiting an amplifier output signal having third harmonic distortion; and a nonlinear feedback circuit comprising a first feedback transistor, a second feedback transistor coupled in a series circuit to the first feedback transistor, and a third transistor coupled to an intermediate node between the first feedback transistor and the second feedback transistor, wherein the first and second feedback transistors and the third transistor are each configured to operate in Triode mode, wherein the first feedback transistor is configured to receive a first adjustable bias voltage and the third transistor is configured to receive a second adjustable bias voltage, the nonlinear feedback circuit configured to produce a feedback electronic signal having a feedback third harmonic component based on the first and second adjustable bias voltages, wherein the nonlinear feedback circuit is coupled to the amplifier circuit in negative feedback such that the feedback third harmonic component of the feedback electronic signal reduces the third harmonic distortion of the amplifier output signal.