Patent ID: 8185076

Claim:
A radio receiver comprising: an oscillator circuit configured to generate an oscillating signal of a first oscillation frequency, the oscillator circuit including a phase-locked circuit and a voltage-controlled oscillator circuit; a first frequency divider circuit configured to generate a first oscillating signal and a second oscillating signal having a second oscillation frequency and orthogonal to each other by frequency-dividing said oscillating signal generated by said oscillator circuit by a first frequency dividing factor; a frequency converter circuit configured to generate a first intermediate frequency signal and a second intermediate frequency signal having an intermediate frequency and orthogonal to each other by multiplying a received radio frequency signal by the first oscillating signal and the second oscillating signal generated in said first frequency divider circuit and orthogonal to each other; a signal adding circuit configured to generate an intermediate frequency signal synthesized by adding together the first intermediate frequency signal and the second intermediate frequency signal generated in said frequency converter circuit and orthogonal to each other; a test signal generating circuit configured to generate a test signal by frequency-dividing the oscillating signal having said first oscillation frequency generated in said oscillator circuit by a second frequency dividing factor, and inject said test signal into said received radio frequency signal in an input section of said frequency converter circuit, the test signal generating circuit including at least one second frequency divider circuit; and controlling means for setting the first frequency dividing factor of said first frequency divider circuit and the second frequency dividing factor of said second frequency divider circuit according to a channel frequency.