| 摘要 |
In a frequency adjusting circuit, an oscillator outputs cosine and sine waves. A quadrature demodulator extracts and outputs the baseband signal of an in-phase component, from a signal received by an antenna, using the cosine wave; and the baseband signal of a quadrature component, from the received signals using the sine wave. First and second A/D converters convert the baseband signals into digital signals. First and second despreaders despread the digital signals. A frequency error detection section detects the error between the frequency of the received signal and the frequency of the cosine and sine waves from the values of the signals output from the despreaders. A reference oscillator outputs the value of an oscillation frequency as the frequency of the cosine and sine waves, and changes the value of the oscillation frequency to cancel the detected frequency error. <IMAGE> |
