Demodulators – Phase shift keying or quadrature amplitude demodulator – Including logic element
Reexamination Certificate
2011-03-22
2011-03-22
Chang, Joseph (Department: 2817)
Demodulators
Phase shift keying or quadrature amplitude demodulator
Including logic element
C329S304000, C375S329000
Reexamination Certificate
active
07911266
ABSTRACT:
A low complexity and low power phase shift keying demodulator structure includes a digitizer, a phase-transition-independent carrier clock extractor, a binary correlater, a delay element, and a sampler. The digitizer digitizes a BPSK signal for an output waveform. The phase-transition-independent carrier clock extractor detects the phase transition on the output of the digitizer and produces a carrier clock signal. The binary correlater has correlated processes to the output signal of the digitizer and carrier clock signal obtained from the phase-transition-independent carrier clock extractor. The sampler samples the signal from the binary correlater according to the signal from the delay element in order to finish the demodulation with only a small capacitance.
REFERENCES:
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patent: 4704582 (1987-11-01), Dixon et al.
patent: 4744094 (1988-05-01), McCarren
patent: 5844907 (1998-12-01), Uchiki et al.
patent: 6341146 (2002-01-01), Johnson et al.
Gong Cihun-Siyong
Shiue Muh-Tian
Yao Kai-Wen
Chang Joseph
National Central University
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