Demodulator logic for frequency shift keyed signals

Details Demodulator logic for frequency shift keyed signals Demodulator logic for frequency shift keyed signals

1984-05-24

1986-02-18

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

329104, 375 88, H04L 2714

Patent

active

045717389

ABSTRACT:
A demodulator logic for FSK signals on an RF carrier in a direct conversion radio receiver, wherein the received signals are mixed with a local oscillator to provide quadrature baseband signals, characterized in that the demodulator logic comprises two clocked D-type flip-flops, FF1,FF2 one baseband signal being applied direct to the clock input CK of one flip-flop and inverted to the clock input CK of the other flip-flop, the second baseband signal being applied to the D inputs of both flip-flops, one input Q from one flip-flop being algebraically combined with one output Q from the other flip-flop to provide a demodulator signal output of the receiver, the two flip-flop outputs being chosen so that for a given FSK value they always have the same logic value.

REFERENCES:
patent: 4193034 (1980-03-01), Vance
patent: 4322851 (1982-03-01), Vance
patent: 4486715 (1984-12-01), Maas et al.

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