| 摘要 |
Frequency conversion into a first intermediate frequency which is higher than a received frequency band is performed for a received signal by using a mixer 63 and a PLL 64. Next, an output of the mixer 63 is frequency converted into a second intermediate frequency of base band by using a quadrature mixer formed by mixers 67, 68 and a phase shifter 70. At this time, a frequency of local oscillation signal of a PLL 69 supplied to the quadrature mixer is controlled so as to be switched, depending on a position of received segment, between a frequency which is higher than the first intermediate frequency and a frequency which is lower than the same.
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