| 摘要 |
PROBLEM TO BE SOLVED: To reduce performance degradation due to AC coupling without increasing an ADC sampling rate as with an IF sampling technique while suppressing cost of analog circuits through use of AC coupling.SOLUTION: A receiver antenna 11 receives a reception signal in a frequency spectrum bandwidth BW that satisfies BW=F/2, and an RF local oscillator 13 generates an RF local signal that satisfies F=F-F/2, while an RF mixer 12 down-converts the reception signal to satisfy F=F-F=F/2. The DC component of the frequency spectrum of the signal converted by ADC 17 is substantially zero, and the influence of configuring an amplifier 15 with AC coupling and eliminating the DC component by high-pass filters 14, 16 on the signal waveform is suppressed. |
