Differential phase demodulator for PSK-modulated signals

Details Differential phase demodulator for PSK-modulated signals Differential phase demodulator for PSK-modulated signals

1990-12-18

1992-06-16

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329310, 375 82, 375 84, H03D 318

Patent

active

051227584

ABSTRACT:
A differential phase demodulator for demodulating a PSK-modulated signal including a zero-cross detector for detecting zero-cross points of intermediate frequency signals of the PSK-modulated signal and generating a zero-cross detection signal; a synchronization circuit for synchronizing an externally supplied baud timing signal with the zero-cross detection signal; an oscillator for generating clock pulses; a counter for counting the clock pulses and producing a pulse count; a phase difference detector for calculating the count per period of the synchronized baud timing signal and outputting the result as the phase difference data; and a decision circuit for outputting demodulated data based on the phase difference data.

REFERENCES:
patent: 3590381 (1971-06-01), Ragsdale
patent: 3643023 (1972-02-01), Ragsdale et al.
patent: 3997847 (1976-12-01), Tong
patent: 4680553 (1987-07-01), Kimure et al.

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