Patent ID: 8315584

Claim:
A semiconductor integrated circuit, comprising: a first RF circuit, coupled to an antenna circuit which receives a broadcast signal having a desired frequency, and configured to amplify or attenuate the broadcast signal; a local oscillator configured to generate a local oscillator signal having a frequency depending on the broadcast signal; a first mixer configured to receive the local oscillator signal of the local oscillator, and to convert an output of the first RF circuit into a predetermined intermediate-frequency signal or baseband signal; a second RF circuit whose input terminal is grounded through an impedance equivalent to or almost the same as an output impedance of the antenna circuit; a second mixer configured to receive the local oscillator signal of the local oscillator, and to convert an output of the second RF circuit into a predetermined intermediate-frequency signal or baseband signal; a combiner configured to combine outputs of the first and the second mixers; and an intermediate-frequency signal processing circuit configured to receive a combined output from the combiner, and to perform intermediate-frequency or baseband signal processing.