Frequency shift keying demodulation circuit using logic circuitr

Details Frequency shift keying demodulation circuit using logic circuitr Frequency shift keying demodulation circuit using logic circuitr

1996-09-20

1998-07-21

Mis, David

Demodulators

Frequency shift keying or minimum shift keying demodulator

Including logic element (e.g., logic gate or flip-flop

329302, 375328, 375334, H03D 300, H04L 2714

Patent

active

057839670

ABSTRACT:
A miniaturized FSK demodulation circuit for accurately demodulating a signal having a small modulation index comprises a multiplier for multiplying a FSK modulated input signal by 4, an oscillator for generating a first signal having the same frequency and phase as the input signal, a phase shifter for producing a second signal by phase shifting the first signal by 90.degree., a first mixer receptive of the multiplied input signal and the first signal for producing a first mixed signal, a second mixer receptive of the multiplied input signal and the second signal for producing a second mixed signal, low pass filters and limiter circuits for converting baseband frequency components of the first and second mixed signals into first and second digital signals, a phase detector for detecting a phase shift in accordance with a difference in phase between the first and second digital signals in accordance with four rising and falling edges of the first and second digital signals, a counter for counting the number of rising and falling edges of the first and second digital signals, a signal decoding circuit receptive of output signals of the phase detector and the counter, and a synchronizing circuit receptive of output signals of the decoding circuit and the counter.

REFERENCES:
patent: 4238783 (1980-12-01), Miller
patent: 5453714 (1995-09-01), Madsen
patent: 5612976 (1997-03-01), Granger-Jones

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