Patent ID: 8373503

Claim:
A circuit that reduces third-order intermodulation (IM3) product distortion, the circuit comprising: a transconductance amplifier comprising a first transistor configured to conduct a first current related to a voltage difference between a first terminal and a second terminal of the first transistor, the first terminal being coupled to receive an RF input voltage (Vin) having a DC component and an AC component, the first transistor also having third terminal for conducting the first current controlled by Vin; and an IM3 canceller circuit comprising a second transistor configured to conduct a second current related to a voltage difference between a fourth terminal and a fifth terminal of the second transistor, the fourth terminal being coupled to substantially receive only the DC component of Vin, the fifth terminal coupled to substantially receive only the AC component of Vin, the second transistor also having a sixth terminal for conducting the second current controlled by the AC component such that an increase in the first current conducted by first transistor occurs during a decrease in the second current conducted by the second transistor, and vice versa, wherein the third terminal of the first transistor is coupled to the sixth terminal of the second transistor such that the second current at least partially offsets IM3 distortion.