FSK demodulator

Details FSK demodulator FSK demodulator

1989-10-05

1991-01-22

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329323, 375 80, 375 88, H03D 300

Patent

active

049873741

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 time-delay demodulation. 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.. For a .DELTA..omega.of 4 MHz, this gives a .DELTA.t=62.5 nonoseconds. As a result, it is easy to achieve a delay line using multiple tap positions for 62.5 nonoseconds total delay.

REFERENCES:
patent: 4583048 (1986-04-01), Gumacos et al.

Affiliated with

Also associated with

Rating

FSK demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with FSK demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FSK demodulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1556864