Patent ID: 7551906

Claim:
An AM/FM radio receiver, comprising: a local oscillation circuit which generates a local oscillation signal; first mixture circuit which mixes the local oscillation signal outputted from said local oscillation circuit and a FM radio broadcast signal to generate an intermediate frequency signal for FM broadcasting; first divide circuit which divides the local oscillation signal outputted from said local oscillation circuit; and second mixture circuit which mixes the local oscillation signal divided in said first divide circuit and an AM radio broadcast signal to generate an intermediate frequency signal for AM broadcasting; wherein said local oscillation circuit, comprising: an oscillator which operates with a prescribed reference frequency; reference oscillator which generates a reference oscillation signal using said oscillator; frequency doubler circuit which multiplies the frequency of the reference oscillation signal outputted from said reference oscillator; and second divide circuit which divides the reference oscillation signal outputted from said frequency doubler circuit to generate a reference oscillation signal with a frequency of the greatest common divisor between the frequency of the reference oscillation signal outputted from said frequency doubler circuit and an assigned frequency per one channel in AM radio broadcasting or the frequency determined by multiplying the assigned frequency divided by an integer by a divide ratio of said first divide circuit.