I/Q imbalance compensation

A method for compensating for in-phase/quadrature (I/Q) phase path imbalance, the method comprising:

• processing an I-path signal with I-path circuitry by filtering the I-path signal with a first analog filter;
• processing a Q-path signal with Q-path circuitry by filtering the Q-path signal with a second analog filter;
• determining a compensation parameter for an I/Q imbalance compensation circuit to compensate for an initial mismatch between the I-path circuitry and the Q-path circuitry;
• determining a coarse adjustment based on the compensation parameter;
• applying the coarse adjustment to at least one of the first analog filter or the second analog filter to reduce the initial mismatch between the I-path circuitry and the Q-path circuitry;
• and
• processing a digital version of the I-path signal and a digital version of the Q-path signal to compensate for a residual mismatch between the I-path circuitry and the Q-path circuit with the coarse adjustment applied to the at least one of the first analog filter or the second analog filter.

A device for processing radio frequency signals, comprising:

• I-path circuitry configured to process an I-path signal, the I-path circuitry comprising a first analog filter configured to filter the I-path signal and a first frequency mixer configured to frequency-convert the I-path signal;
• Q-path circuitry configured to process a Q-path signal, the Q-path circuitry comprising a second analog filter configured to filter the Q-path signal and a second frequency mixer configured to frequency-convert the Q-path signal;
• an oscillator configured to provide an in-phase local oscillator signal to the first frequency mixer and a quadrature-phase local oscillator signal to the second frequency mixer;
• non-transitory memory storage;
• and
• one or more processors in communication with the non-transitory memory storage, wherein the non-transitory memory storage store instructions for execution by the one or more processors to:
• determine a compensation parameter to compensate for an initial mismatch between the I-path circuitry and the Q-path circuitry;
• determine a coarse adjustment based on the compensation parameter;
• apply the coarse adjustment to at least one of the first analog filter or the second analog filter to reduce the initial mismatch between the I-path circuitry and the Q-path circuitry;
• and
• process a digital version of the I-path signal and a digital version of the Q-path signal to compensate for a residual mismatch between the I-path circuitry and the Q-path circuitry with the coarse adjustment applied to the at least one of the first analog filter or the second analog filter.