Frequency-dependent IQ mismatch calibration for radio frequency (RF) transmitters

A non-transitory machine-readable storage medium having computer code stored therein, which when executed by one or more processors of a computing system, causes the computing system to perform operations for calibrating a radio frequency (RF) transmitter to compensate for a frequency-dependent in-phase quadrature (FDIQ) mismatch of the RF transmitter, the operations comprising:

• determining an in-phase quadrature (IQ) amplitude and phase mismatch of the RF transmitter for a lower side band (LSB) and an IQ amplitude and phase mismatch of the RF transmitter for an upper side band (USB);
• determining the FDIQ mismatch based on linear fitting the IQ amplitude and phase mismatch for the LSB and the IQ amplitude and phase mismatch for the USB;
• modifying the FDIQ mismatch based on flipping a FDIQ phase mismatch in the LSB and flipping a FDIQ phase mismatch in the USB to generate a modified FDIQ mismatch;
• determining Fourier coefficients based on applying an inverse fast Fourier transform to the modified FDIQ mismatch;
• and
• determining FIR coefficients for a finite impulse response (FIR) filter of the RF transmitter based on windowing the Fourier coefficients.