Patent ID: 8244197

Claim:
A receiving device having an image rejection mixer which comprises an input terminal to which a signal in a first radio frequency band or a signal in a second radio frequency band narrower than the first radio frequency band is inputted, a first mixer and a second mixer connected in parallel fashion to the input terminal, a local signal oscillator for oscillating local signals having a phase difference from each other and being applied to the first mixer and the second mixer, and a filter circuit for combining a signal from the first mixer with a signal from the second mixer by rotating at least one of a phase of the signal from the first mixer and a phase of the signal from the second mixer, wherein when a signal in the first radio frequency band is inputted to the input terminal, the first mixer and the second mixer convert the input signal in the first radio frequency band to a signal in a first intermediate frequency band by using a first local signal from the local signal oscillator, while the filter circuit attenuates an image interfering signal existing in the first intermediate frequency band by means of a first attenuation band, and also, when a signal in the second radio frequency band is inputted to the input terminal, the first mixer and the second mixer convert the input signal in the second radio frequency band to a signal in a second intermediate frequency band by using a second local signal from the local signal oscillator, and the filter circuit attenuates an image interfering signal existing in the second intermediate frequency band by means of a second attenuation band that is narrower than the first attenuation band, wherein the amount of attenuation in the second attenuation band is greater than the amount of attenuation in the first attenuation band.