Demodulator logic for frequency shift keyed signals
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United States of America Patent
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-
Feb 18, 1986
Grant Date -
N/A
app pub date -
May 24, 1984
filing date -
Jun 2, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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