Full threshold FM demodulator

Details Full threshold FM demodulator Full threshold FM demodulator

1989-06-16

1991-07-23

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

455208, 455209, 455337, H03D 306

Patent

active

050346954

ABSTRACT:
A full threshold FM (Frequency Modulated) signal demodulator can be achieved by utilizing FM deviation compression feedback technics. An FM signal is coupled to a mixer (10) wherein a signal from a local oscillator is mixed. The output of the mixer is coupled to a selective IF amplifier. The IF amplifier couples the signal to a limiter amplifier, the output of the limiter is coupled to a parallel BPF and AM demodulator system. The output signal of the AM demodulators are summed by a summing amplifier. The output signal is simultaneously feed back through at least two frequency compensation networks. The output signal of the FCN is feedback to two BPFs (13 and 13'). Further, the output signal of the FCN is feedback to a local oscillator (17). The output of the local oscillator (17) is feedback into the mixer (10). The improved demodulated signal is sampled at an output (26).

REFERENCES:
patent: 2272401 (1942-02-01), Chaffee
patent: 3437941 (1969-04-01), Leary
patent: 4087756 (1978-05-01), Rogers, Jr.
patent: 4523324 (1985-06-01), Marshall

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