H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/15
H03D 3/20 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1067587
ABSTRACT The present invention relates to an n-phase PSK demodulator. The demodulator is comprised of a voltage controlled oscillator; ? phase detectors for comparing an incoming PSK-modulated signal with the output signal of the oscillator to provide phase-difference-representing signals; ? phase shifters connected to the output of the oscillator and the inputs of the phase detectors for shifting the phase of the oscillator output by 2K.pi./n radians (K=0, 1, 2, ..., n-1) and ? absolute-value detecting circuits for converting the phase-dif- ference-representing signals into absolute values. A circuit is provided for extracting from the output signals of the absolute value detecting circuits phase error signals mutually displaced by 2.pi./n radians. Analog to digital convertors are provided for converting the output signals of the phase detectors and for synthesizing the converted signal. Finally, a gate switching control is provided for switching the error signal producing circuit in response to the synthesized signal so that the error signal is selectively fed to the oscillator.
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