Data terminal comprising a demodulator for a FSK phase-coherent

Details Data terminal comprising a demodulator for a FSK phase-coherent Data terminal comprising a demodulator for a FSK phase-coherent

1995-10-18

1996-12-31

Chin, Wellington

Pulse or digital communications

Receivers

Angle modulation

329325, 331 25, H03D 318, H03D 302, H03L 700

Patent

active

055901573

ABSTRACT:
Data terminal comprising a demodulator for a FSK phase-coherent modulated signal having at least two frequencies, comprising a PLL circuit (10) in which a phase detector is combined with a real-time integrator (15) and in which a sequencer (5) is included, so that the modulated signal is integrated around the zero crossings before a clock signal and digital data are extracted from this signal after a phase lock. As long as the PLL circuit (10) is in the unlocked state, the frequency with which the integrator (15) is driven by the sequencer (5) is equal to half the bit rate of the modulated signal while, for that matter, this frequency is equal to the bit rate.

REFERENCES:
patent: 3674935 (1972-07-01), Lawrence
patent: 4556866 (1985-12-01), Gorecki
patent: 4694257 (1987-09-01), Klein et al.
patent: 4743867 (1988-05-01), Smith
patent: 4785255 (1988-11-01), Lucak et al.
patent: 5079526 (1992-01-01), Heck
patent: 5249206 (1993-09-01), Appelbaun et al.
patent: 5276712 (1994-01-01), Pearson
patent: 5278702 (1994-01-01), Wilson et al.
patent: 5475344 (1995-12-01), Mareatis et al.
patent: 5485484 (1996-01-01), Williams et al.
Motorola Semiconductor Technical Data Advanced Information MC 68194 Carrier Band Modem (cbm) Motorola Feb. 12, 1986.

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