PSK demodulator having an AFC circuit

Details PSK demodulator having an AFC circuit PSK demodulator having an AFC circuit

1985-03-21

1986-05-27

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 375 80, 375 81, 375 83, H03D 302, H04L 2722

Patent

active

045917973

ABSTRACT:
A PSK demodulator is disclosed. The demodulator includes a voltage controlled oscillator response to a control circuit in a frequency converter for converting an input PSK signal as a function of the output of the voltage controlled oscillator. A carrier recovery circuit recovers a carrier wave from the output of the frequency converter means and applies the recovered output to a band-pass filter. A phase detector detects the output of the frequency converter as a function of the output of the band-pass filter and provides a demodulated signal and function thereof. A phase comparator is provided for detecting the phase difference between the input and output signals of the band-pass filter and a low-pass filter responsive to the output of the phase comparator provides the control signal.

REFERENCES:
patent: 4313219 (1982-01-01), Gabler et al.
patent: 4361894 (1982-11-01), Kurihara et al.

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