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Data demodulation circuit for FSK modulated RF signal receiver providing wide-band 90amp;deg; baseband phase shifting
Data demodulation circuit for FSK modulated RF signal receiver providing wide-band 90amp;deg; baseband phase shifting
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机译:用于FSK调制RF信号接收器的数据解调电路,提供宽带90°基带相移
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摘要
An FSK radio receiver of direct conversion type, which derives baseband in-phase and phase quadrature signals from a received FSK RF signal in respective mixers by applying local oscillator signals to the mixers differing in phase by 90°, in which wide-band baseband 90. degree. phase shifting circuits formed of only digital logic elements phase shift the in-phase and phase quadrature signals to enable a demodulated digital data signal to be obtained by subsequent digital processing. In that processing, signals having a frequency that is double that of the in-phase and phase quadrature signals are derived and used to derive the demodulated data signal, ensuring high accuracy of detection and lowering the accuracy required for the local oscillator frequency.
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