Patent ID: 7916813

Claim:
A receiver device comprising: a frequency converter which converts a high frequency signal transmitted in a frequency shift keying scheme into an intermediate frequency signal having a predetermined frequency, to output said intermediate frequency signal therefrom; an amplitude limiter which limits an amplitude of an output signal from said frequency converter for output; an orthogonal demodulator which includes: a first signal generator which generates a pair of first local oscillation signals of which frequencies are k multiple of said predetermined frequency and of which phases are orthogonal to each other, k being an odd integer equal to or greater than 3; and I-side and Q-side mixers each of which mixes an output signal from said amplitude limiter and each of said pair of first local oscillation signals to output a mixed signal therefrom, said orthogonal demodulator generating a demodulation signal based on output signals from said I-side and Q-side mixers; and an oscillator which generates a basic oscillation signal having a frequency of n·m·k multiple of said predetermined frequency, m and n being integers equal to or greater than 2, wherein: said frequency converter includes: a second signal generator which generates a second local oscillation signal based on said basic oscillation signal; and a mixer which mixes said high frequency signal and said second local oscillation signal to output a mixed signal therefrom; and said first signal generator includes: a divider which divides said basic oscillation signal by m to output a divided signal as a divided oscillation signal; and a phase shifter which generates said first local oscillation signals by dividing said divided oscillation signals by n.