Method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a quadrature feedback mixer configuration

A method, comprising:

• in a single chip comprising a radio frequency (RF) receiver and an RF transmitter including a power amplifier,
• generating, with the power amplifier, an output signal in response to an input signal;
• generating, with a quadrature feedback mixer circuit, a feedback signal by performing a frequency downconversion operation on the output signal;
• and
• selectively inserting the feedback signal at insertion points in the RF receiver to characterize performance of the power amplifier by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points within the RF receiver.

A system implemented in a single chip, comprising:

• a radio frequency (RF) receiver;
• an RF transmitter, wherein the RF transmitter comprises a power amplifier configured to generate an output signal in response to an input signal;
• a quadrature feedback mixer circuit configured to perform a frequency downconversion operation on the output signal to generate a feedback signal;
• and
• a selection circuit in the RF receiver configured to insert the generated feedback signal at insertion points in the RF receiver during a calibration mode by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points.