Direct conversion FSK receiver using frequency tracking filters

Details Direct conversion FSK receiver using frequency tracking filters Direct conversion FSK receiver using frequency tracking filters

1994-09-08

1995-09-19

Grimm, Siegfried

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

375 80, 375102, 375103, 375120, 375324, 375349, 375350, 375376, H04L 27148, H04L 27152

Patent

active

054518997

ABSTRACT:
In a direct conversion receiver in which received radio frequency signals are mixed with quadrature local oscillator signals in I and Q channels, the output signals from the mixers are applied to a phase detector by way of respective frequency tracking filters to reduce the noise bandwidth and improve the sensitivity.

REFERENCES:
patent: 3611195 (1971-10-01), Parham
patent: 4953010 (1990-08-01), Cowley
patent: 5040192 (1991-08-01), Tjahjadi
patent: 5309480 (1994-05-01), Powell, II et al.
patent: 5361408 (1994-11-01), Watanabe et al.

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