Bias Point Selection Circuitry for Improved Linearity

A method of determining a bias voltage for an input transistor in wireless circuitry, the method comprising:

• with a voltage generator, sequentially outputting a plurality of different voltages to a replica transistor that is a replica of the input transistor;
• with a current-to-voltage converter, converting different current levels flowing through the replica transistor when the plurality of different voltages are provided to the replica transistor into corresponding analog voltages;
• and
• with an analog-to-digital converter, converting the analog voltages into corresponding digital codes.

Circuitry comprising:

• a radio-frequency circuit having an input transistor;
• and
• bias voltage determination circuitry configured to determine a bias voltage for the input transistor that produces a third order transconductance of zero for the input transistor, the bias voltage determination circuitry including
• a replica transistor having identical physical properties as the input transistor,
• a voltage generator coupled to a gate terminal of the replica transistor, and
• a current-to-voltage converter coupled to a source-drain terminal of the replica transistor.