Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2006-02-07
2006-02-07
Shingleton, Michael B (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S016000, C331S017000, C331S025000, C375S376000
Reexamination Certificate
active
06995617
ABSTRACT:
A data-directed frequency-and-phase lock loop for an offset-QAM modulated signal comprises a first multiplier that multiplies the signal by the output of a VCO. The output of the first multiplier is phase-shifted by a second multiplier, then convolved by a third multiplier. The output of the third multiplier is split, with each portion being passed through a frequency-shift multiplier and a frequency-and-phase lock loop. The output of the two frequency-and-phase lock loops is summed and returned to the VCO to complete the feedback loop.
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Citta Richard W.
LoPresto Scott M.
Xia Jingsong
Zhang Wenjun
Micronas Semiconductors, Inc.
O'Shea Getz & Kosakowski P.C.
Shingleton Michael B
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