Phase comparator circuit

Details Phase comparator circuit Phase comparator circuit

2005-10-25

2005-10-25

Tran, Khai (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C327S012000

Reexamination Certificate

active

06959061

ABSTRACT:
A phase comparison circuit has (1) a data discriminator to which a data signal is input for discriminating the data signal using a clock signal, (2) a logic circuit for outputting the exclusive-OR data of the data signal and a data discrimination signal output by the data discriminator and inputting the result of the exclusive-OR as a phase-difference signal to a clock generator which generates the clock signal, (3) an erroneous-synchronization phase detector for detecting whether the phase difference between the data signal and the clock signal resides within a range of phases for which there is a possibility of erroneous synchronization, and (4) an output fixing unit which holds the phase-difference signal at a fixed value if the phase difference resides within the above-mentioned range of phases, thereby it is possible to eliminate erroneous synchronization in which the clock generator is locked to a phase other than a target phase.

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