Radio receiver for FSK signals

Details Radio receiver for FSK signals Radio receiver for FSK signals

1978-07-06

1980-03-11

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

178 661, 329104, H04L 2714

Patent

active

041930347

ABSTRACT:
A simple radio receiver for FSK signals as used in a paging system. RF signals from the aerial are mixed in two high gain mixers with local oscillator signals which are in quadrature and which are at the nominal center frequency of the input signal. The output from the mixers are low-pass filtered so as to extract the difference frequency. The low-pass filter bandwidth is equal to the sideband width of the RF signal. Baseband signals from the filters are now amplified in high gain limiting amplifier stages which deliver fully symmetrically limited outputs at logic level to a D-type flip-flop.

REFERENCES:
patent: 2977417 (1961-03-01), Doelz et al.
patent: 3439283 (1969-04-01), Danielson
patent: 3906376 (1975-09-01), Bass

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