| 摘要 |
A frequency converter converts a high frequency signal transmitted in a frequency shift keying scheme into an intermediate frequency signal having a predetermined frequency, to output the intermediate frequency signal therefrom. An amplitude limiter limits an amplitude of an output signal from the frequency converter for output. An orthogonal demodulator includes: a first signal generator which generates a pair of first local oscillation signals of which frequencies are k multiple of the predetermined frequency and of which phases are orthogonal to each other, k being an odd integer equal to or greater than 3. I-side and Q-side mixers each mix an output signal from the amplitude limiter and each of the pair of first local oscillation signals to output a mixed signal therefrom. The orthogonal demodulator generates a demodulation signal based on output signals from the I-side and Q-side mixers.
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