| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem in the conventional image rejection mixer that a signal error occurs at demodulation due to the generation of phase imbalance in which an output of a 90-degree phase converter is not accurately 90 degrees and amplitude imbalance in which Q-channel and I-channel gains fluctuate due to an environment condition change such as temperature and frequency changes.SOLUTION: An amplitude phase correction circuit stores a difference between the amplitude and the phase of an IF signal when an RF signal to be corrected is input into an image rejection mixer and the amplitude and the phase of an ideal IF signal. When the RF signal is input from an antenna, by subtracting therefrom the difference of the amplitude and the phase stored in the amplitude phase correction circuit, the amplitude imbalance and the phase imbalance of the IF signal are corrected.</p> |
