Patent ID: 8320867

Claim:
A gain imbalance measurement device which receives an I signal and a Q signal from a quadrature demodulator for demodulating a signal to be demodulated, the signal including a plurality of carrier signals respectively different from each other in frequency, and which measures a gain imbalance, the gain imbalance measurement device comprising: an I-signal amplitude deriver that derives a plurality of first amplitudes of the I signal, each corresponding to one of the plurality of carrier signals; a Q-signal amplitude deriver that derives a plurality of second amplitudes of the Q signal, each corresponding to one of the plurality of carrier signals; a carrier amplitude ratio deriver that derives a plurality of ratios between respective ones of the plurality of first amplitudes of the I signal and the plurality of second amplitudes of the Q signal, each corresponding to one of the plurality of carrier signals; and a gain imbalance deriver that derives the gain imbalance based on all of the plurality of ratios derived by the carrier amplitude ratio deriver.