| 摘要 |
Disclosed is an apparatus and a method for down-converting frequencies of an input signal by separating the signal to which at least two frequencies are allocated according to each frequency, and then outputting at least two digital IF signals in a communication system. The digital down-converting apparatus includes a band-pass filter, an analog-to-digital converter, down-converters, up-converters, and Serializer/Deserializeres, etc. First, the signal to which at least two frequencies are allocated is down-converted into baseband signals respectively. Then, the baseband signals are up-converted into signals of a predetermined frequency respectively.
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