Second Order Intermodulation Injection for Non-linearity Cancellation

Circuitry comprising:

• a first input transistor configured to receive a radio-frequency signal;
• a second input transistor configured to receive the radio-frequency signal;
• a pair of transistors cross-coupled with the first and second input transistors;
• and
• a second order intermodulation (IM2) generation circuit coupled to a virtual ground node between the pair of transistors.

Amplifier circuitry comprising:

• a first transistor having a gate terminal and a source-drain terminal;
• a second transistor having a gate terminal and a source-drain terminal;
• a third transistor having a gate terminal shorted to the gate terminal of the first transistor, a first source-drain terminal coupled to the source-drain terminal of the second transistor, and a second source-drain terminal coupled to a tail node;
• a fourth transistor having a gate terminal shorted to the gate terminal of the second transistor, a first source-drain terminal coupled to the source-drain terminal of the first transistor, and a second source-drain terminal coupled to the tail node;
• and
• a second order intermodulation (IM2) injection transistor having a first source-drain terminal coupled to the tail node and having a second source-drain terminal coupled to a power supply line.