FSK demodulator

Details FSK demodulator FSK demodulator

1989-11-13

1991-10-01

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

329336, 329337, 375 76, 375 80, 375 88, H03D 300, H03D 306

Patent

active

050537172

ABSTRACT:
An improved multilevel FSK demodulator, according to the invention, is provided that down-converts the IF frequency back to baseband quadrature via dual mixers. The improved multilevel FSK demodulator uses controllable time-delay in the demodulation process. This method requires a 90.degree. phase difference between 2 modulated signals to produce a maximum demodulated output amplitude at the maximum frequency deviation. Since the IF frequencies have been down-converted back to baseband quadrature, these 2 signals are only "out of phase" by an amount .DELTA.t that is equal to 90.degree./d.omega.. A further aspect of this invention addresses minimizing the DC offset from the demodulator by providing a feedback signal which controls the amount of delay provided to one of the quadrature signals.

REFERENCES:
patent: 4451792 (1984-05-01), Gay

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