| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive receiver with a low power and high performance, by realizing an antialiasing filter with high accuracy and a high dynamic range for digitizing of an intermediate frequency and attaining circuit integration. SOLUTION: Intermediate frequency signals outputted from a frequency mixer 3 are given to a bandpass filter 6A, which selects an intermediate frequency signal of a desired channel, and an A/D converter 12 analog/digital-converts the output signal from the bandpass filter 6A by using a prescribed sampling frequency. The anti-aliasing filter 11 is provided to a prestage of the A/D converter 12. The anti-aliasing filter 11 includes notch filters that attenuate signals with frequency higher than an integral multiple of the sampling frequency by the intermediate frequency, and a frequency lower than an integral multiple of the sampling frequency by the intermediate frequency. COPYRIGHT: (C)2007,JPO&INPIT
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