| 摘要 |
An object of the present invention is to integrate circuits for frequency conversion processing of an input signal of the GHz band. In a receiver, an input signal from an antenna is amplified after components thereof outside a frequency band for communication network being removed, and is supplied to an arithmetic processing unit. A plurality of sampling circuits within the arithmetic processing unit respond to a plurality of clock signals of which frequencies are equal and of which phases are different, respectively, and sample the input signal after amplification. The sum-of-products arithmetic unit within the arithmetic processing unit responds any one of the clock signals and performs sum-of-products operation periodically using a plurality of sample signals exhibiting the sampling results of all the sampling circuits, respectively. A signal outputted from the sum-of-products arithmetic unit includes a reflected component equivalent to the component within the frequency band of the input signal being frequency-converted. A channel selection unit extracts the reflected component from the signal and converts the carrier frequency of the reflected component into an intermediate frequency. A reflected component after conversion is demodulated.
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