| 摘要 |
PROBLEM TO BE SOLVED: To simplify a circuit and to reduce power consumption, which are suitable for a small portable terminal, by shifting the band of a carrier based on conversion circuit output. SOLUTION: The I and Q components of a received carrier are converted in an A/D converter 101. A phase generation circuit 108 outputs a phase Φwhich is natural number-times as much as a unit angle Δ with a clock period, generates thirteen partial phases Φthrough a conversion circuit 109 and generates thirteen control signals D based on them. The control signal D and the output of the A/D converter 101 are inputted to negative shift/no-shift/ positive shift circuits 102, 104 and 103 and the outputs of the respective circuits are outputted through finite impulse response filters 105-107. The filter 107 outputs the signals I-1 and Q-1 of a low side band channel -1, the filter 106 the signals I0 and Q0 of a center band channel 0 and the filter 105 the signals I+1 and Q+1 of a high side band channel +1 with the reception of a mutil-carrier signal. |
