Gain in balance measuring apparatus, phase difference corresponding value measuring apparatus, method, program, and recording medium

Abstract

An object of the present invention is to increase measurement precision for measuring errors of a quadrature demodulator. An error measurement devicereceives an I signal and a Q signal from a quadrature demodulatorfor demodulating a signal to be demodulated including multiple carrier signals respectively different from each other in frequency, and measures a gain imbalance which is a ratio of the amplitude of the Q signal to the amplitude of the I signal. Further, the error measurement deviceincludes an I-signal amplitude deriving unitI which derives the amplitude of the I signal for the respective carrier signals, a Q-signal amplitude deriving unitQ which derives the amplitude of the Q signal for the respective carrier signals, a carrier amplitude ratio deriving unitwhich derives a ratio of the amplitude of the Q signal to the amplitude of the I signal for the respective carrier signals based on the results derived by the I-signal amplitude deriving unitI and the Q-signal amplitude deriving unitQ, and an averaging unitwhich derives the gain imbalance GB by averaging the results derived by the carrier amplitude ratio deriving unit