Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1998-05-19
2000-05-02
Kinkead, Arnold
Demodulators
Phase shift keying or quadrature amplitude demodulator
375326, 375327, 375328, 375355, H04L 2714, H03D 318
Patent
active
060577304
ABSTRACT:
A clock recovery circuit includes an A/D converter and samples sampled signals from a received signal of a modulation rate depending on a sampling clock signal with a frequency twice the predetermined modulation rate. An amplitude detector detects an amplitude of a first sampled signal and an amplitude of a second sampled signal following the first samples signal. By comparing the amplitudes of the first and second sampled signals, a smaller one of the first and second sampled signals is selected. A phase of the sampling clock signal is controlled so that the amplitude of the smaller signal is minimized.
REFERENCES:
Japanese Office Action issued Jun. 23, 1999 in a related application and English-translation of the relevant portions.
Kinkead Arnold
NEC Corporation
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