| 摘要 |
In an image rejection mixer of a receiving device (14) of the invention, when a signal of a first radio frequency band is input to input terminal (16), first mixer (17) and second mixer (18) convert the input signal of the first radio frequency band into a signal of a first intermediate frequency band by the use of a first local signal from local signal oscillation unit (19) and a filter circuit attenuates an image disturbing signal existing in the first intermediate frequency band, and when a signal of a second radio frequency band is input to the input terminal, first mixer (17) and second mixer (18) convert the input signal of the second radio frequency band into a signal of a second intermediate frequency band by the use of a second local signal from the local signal oscillation unit and the filter circuit attenuates an image disturbing signal existing in the second intermediate frequency band. The first intermediate frequency band and the second intermediate frequency band are partly overlapped with each other.
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