Carrier leakage correction method for quadrature modulator

A carrier leakage correction method for a quadrature modulator, the method comprising:

• inputting a test signal with a first frequency to a transmitter and up-converting the test signal with a second frequency;
• down-converting the up-converted test signal with the second frequency;
• detecting a frequency component twice the first frequency in the down-converted test signal;
• and
• adjusting one or a plurality of parameters of the transmitter so as to reduce a magnitude of the detected frequency component twice the first frequency in the down-converted test signal.