Patent ID: 7373124

Claim:
A receiver comprising: a tuning circuit for picking up a reception signal having a predetermined frequency; a local oscillation circuit for forming a local oscillation signal; a first mixer circuit for frequency-converting the reception signal into an intermediate frequency signal by using the local oscillation signal; an intermediate frequency filter for deriving the intermediate frequency signal from an output signal of the first mixer circuit; a signal forming circuit for forming an AC signal having a frequency equal to an intermediate frequency of the intermediate frequency signal; a second mixer circuit supplied with the AC signal and the local oscillation signal; a deriving circuit for deriving a signal having a predetermined frequency or an image frequency from an output of the second mixer circuit; and a detection circuit for detecting a level of the intermediate frequency signal, wherein a self test is performed by supplying the signal derived from the deriving circuit to the tuning circuit and checking a detection output level of the detection circuit.