Frequency-shift-keying detector using digital circuits

Details Frequency-shift-keying detector using digital circuits Frequency-shift-keying detector using digital circuits

1995-06-02

1996-07-23

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329303, 375272, 375324, 375334, H04L 2714

Patent

active

055393551

ABSTRACT:
A signal modulated by frequency-shift keying is input to a detector consisting of an instantaneous phase detection circuit that detects the instantaneous phase of the input signal, a differentiating circuit that differentiates the instantaneous phase to obtain the instantaneous frequency, and a baseband processing circuit that recovers clock and data signals from the instantaneous frequency. To detect the instantaneous phase, the instantaneous phase detection circuit compares the logic levels of the input signal and a clock signal, and filters the resulting bit stream with a digital low-pass filter. The detector consists entirely of digital circuits that are well suited for large-scale integration.

REFERENCES:
patent: 4752742 (1988-06-01), Akaiwa
patent: 5243299 (1993-09-01), Marchetto et al.
patent: 5436589 (1995-07-01), LaRosa et al.
Papers from the 1980 General Meeting of the Institute of Electronics and Communication Engineers of Japan, No. 2107, "Tachi FM Disukuri Kenpa Hoshiki no Tokusel", Akaiwa et al.
Papers from the 1980 General Meeting of the Institute of Electronics and Communication Engineers of Japan, No. 2108, "Tachi FM Disukuri Kenpa Hoshiki ni okeru Chushin Shuhasu to Henchodo Hendo no Hosho", Takase and Akaiwa.
Institute of Electronics and Communication Engineers of Japan, "Dijitaru Shingo Shori", 1st edition, Nov. 10, 1975, pp. 43-45.

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