Patent ID: 7437345

Claim:
An image rejection mixer for acquiring a third signal, which is a single sideband signal, by subjecting a first pair of complex signals, which are 90 degrees out of phase with each other, and a second pair of complex signals, which are 90 degrees out of phase with each other, to analog multiplication, the image rejection mixer comprising: harmonic component suppression means for suppressing a (4N+1)-order harmonic component (where N is an integer) that is contained in said first pair of complex signals, which are 90 degrees out of phase with each other, or said second pair of complex signals, which are 90 degrees out of phase with each other, said harmonic component suppression means comprises a polyphase filter that is formed by cascading K pieces of filter circuits in which a resistor and a capacitor are connected in parallel, the filter circuits being +360/K degrees out of phase with a preceding one.