Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-11-28
2010-12-28
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C329S300000, C331S179000, C332S100000, C340S870030, C375S269000, C375S272000, C375S303000, C375S323000
Reexamination Certificate
active
07860192
ABSTRACT:
A frequency shift keying (FSK) demodulator includes a band-pass filter, an auto-calibration loop, a phase comparator, and an analog-to-digital converter. The band-pass filter is used for shifting phase of an FSK signal to generate a revised FSK signal. The auto-calibration loop is coupled to the band-pass filter for adjusting a center frequency of the band-pass filter. The first input end of the phase comparator is coupled to an output end of the band-pass filter, and the second input end of the phase comparator is used for receiving the FSK signal. The phase comparator is used for comparing the FSK signal with the revised FSK signal and outputting a comparison result. The analog-to-digital converter is coupled to the phase comparator for converting the results of the phase comparator into digital data. Similarly, a frequency modulation (FM) demodulator includes a band-pass filter, an auto-calibration loop, and a phase comparator.
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Chang Kwo-Wei
Li Chun-Yi
Dsouza Adolf
Hsu Winston
Margo Scott
Payne David C
Princeton Technology Corporation
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