Electronic device and operating method to compensate for in-phase/quadrature imbalance

An electronic device, comprising:

• a feedback oscillator configured to generate a feedback oscillation signal;
• a phase shifter configured to receive the feedback oscillation signal and output a first oscillation signal having the feedback oscillation signal shifted to a first phase, and a second oscillation signal having the feedback oscillation signal shifted to a second phase different from the first phase by a defined phase difference;
• an up-conversion mixer configured to generate and output a first loopback signal by mixing the first oscillation signal with a reference tone signal, and generate and output a second loopback signal by mixing the second oscillation signal with the reference tone signal in a measurement mode;
• and
• a receiver configured to generate a first reference IQ signal by down-conversion mixing the first loopback signal, and generate a second reference IQ signal by down-conversion mixing the second loopback signal in the measurement mode,
• wherein the receiver is configured to estimate a phase offset by comparing the defined phase difference between the first oscillation signal and the second oscillation signal with an actual phase difference between the first reference IQ signal and the second reference IQ signal, and estimate a gain offset from the first reference IQ signal and second reference IQ signal.

A method for operating an electronic device, the method comprising:

• generating, by a local oscillator, a local oscillation signal;
• supplying, by the local oscillator, the local oscillation signal to a phase shifter;
• receiving, by the phase shifter, the local oscillation signal;
• generating, by the phase shifter, a first oscillation signal by shifting the local oscillation signal by a first phase, and generating a second oscillation signal by shifting the local oscillation signal by a second phase different from the first phase by a defined phase difference in a measurement mode;
• generating, by an up-conversion mixer, a first loopback signal by up-conversion mixing a reference tone signal with the first oscillation signal, and generating a second loopback signal by up-conversion mixing the reference tone signal with the second oscillation signal;
• generating, by a receiver, a first reference IQ signal by down-conversion mixing the first loopback signal;
• generating, by the receiver, a second reference IQ signal by down-conversion mixing the second loopback signal;
• and
• estimating a gain offset and a phase offset of the receiver according to the first reference IQ signal and the second reference IQ signal.