Phase locked loop circuit and optical communications...

Details Phase locked loop circuit and optical communications... Phase locked loop circuit and optical communications...

2007-02-27

2007-02-27

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S376000, C327S147000, C327S156000, C331S011000, C398S150000

Reexamination Certificate

active

10352162

ABSTRACT:
A clock generator is configured to generate, on the basis of an oscillation frequency clock of a voltage-controlled oscillator, a first signal having a phase the same as the oscillation frequency clock, a second signal having a phase delayed by a first phase amount to the first signal and a third signal having a phase delayed by a second phase amount to the first signal. A phase detection circuit is configured to provide a phase control on the basis of a phase difference between the third signal and an input signal. A frequency detection circuit is configured to sample the first and second signals synchronously with the input signal, thereby performing a frequency control for the voltage-controlled oscillator on the basis of the sampled signals.

REFERENCES:
patent: 4773085 (1988-09-01), Cordell
patent: 6545546 (2003-04-01), Takeshita et al.
patent: 6915081 (2005-07-01), Takeshita et al.
patent: 2005/0058235 (2005-03-01), Beeson et al.

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