Patent ID: 7979029

Claim:
A receiver circuit comprising: a cancellation signal generation section that generates a cancellation signal, the cancellation signal canceling a signal generated by an electronic circuit disposed near a reception section that receives a radio signal; and an addition section that adds the cancellation signal generated by the cancellation signal generation section to a signal in a signal processing system that processes a received signal received by the reception section at a specific position in the signal processing system; a local oscillation signal generation section; an intermediate frequency conversion section that multiplies the received signal received by the reception section by a local oscillation signal generated by the local oscillation signal generation section to convert the received signal to an intermediate-frequency signal, the intermediate frequency conversion section outputting the intermediate-frequency signal to a subsequent stage in the signal processing system; and a filter section that allows a component of the signal output from the intermediate frequency conversion section to pass through, the component being in a band corresponding to an intermediate frequency of the radio signal, the cancellation signal generation section including a phase shifter section that shifts a phase of the local oscillation signal generated by the local oscillation signal generation section by 180 degrees, the cancellation signal generation section generating the cancellation signal by multiplying the signal generated by the electronic circuit by the signal that has been phase-shifted by the phase shifter section; and the addition section adding the cancellation signal generated by the cancellation signal generation section to the intermediate-frequency signal output from the intermediate frequency conversion section in a preceding stage of the filter section.