| 摘要 |
A frequency converter is provided for combining multiple inputs into a single frequency conversion path. A first frequency conversion stage 50 has first and second frequency conversion paths 501 and 502 that receive first and second input signals to produce first and second IF signals respectively. A combiner 19 sums up the first and second IF signals to provide it as one signal to the next frequency conversion stages 60 and 70. Oscillation frequencies of local oscillators 141 and 142 in the paths 501 and 502 are controlled to have a frequency difference FD between them so that the center frequencies of the first and second IF signals have the frequency difference FD between them. The output of the combiner 19 includes components of multi-channels but processed by the same circuits.
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