Apparatus and method for compensating error for analog quadrature modulator (AQM)

A method of compensating error of an Analog Quadrature Modulator (AQM), comprising:

• dividing a returned digital signal into I/Q digital signals and outputting the I/Q digital signals;
• calculating an error compensating signal by performing a prescribed calculation with the I/Q digital signals;
• and
• compensating an error of an inputted signal by applying the calculated error compensating signal.

The method of 8, wherein calculating the error compensating signal comprises:

• calculating DC offset signals for the returned I/Q digital signals;
• calculating a gain compensating signal for compensating a gain of the I/Q digital signals;
• and
• calculating a phase compensating value for compensating a phase of the I/Q digital signals.

A method of compensating error of an Analog Quadrture Modulator (AQM), comprising:

• detecting a DC offset signal by averaging sampling values of returned I/Q digital signals;
• detecting a gain compensating signal using a maximum value in a period of the I/Q digital signals of which the DC offset is compensated;
• detecting a phase compensating value of the I/Q digital signals based on a sum of absolute values for differences between the gain compensated I-digital signals and Q-digital signals;
• and
• compensating AQM error by removing a gain error and the DC offset, after compensating a phase error of the inputted digital signal.