Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-11-16
1994-01-04
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
375120, 307518, H04L 702
Patent
active
052767124
ABSTRACT:
A technique for recovering a clock from a digitally encoded communication signal uses a low-Q resonator and limiter for generating a coarse clock signal comprising a series of rectangular pulses at a frequency substantially equal to the clock (though subject to phase jitter), and a filter circuit, such as a phase-locked-loop ("PLL"), preferably employing a Sequential Phase/Frequency Detector, to reduce the jitter superimposed on the coarse clock signal, so as to yield a well-behaved clock signal. By using a Sequential Phase/Frequency Detector, acquisition-aid circuitry generally is not required for the PLL.
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Bocure Tesfaldet
Digital Equipment Corporation
Kuntz Curtis
LandOfFree
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