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Decision threshold voltage control circuit and decision threshold voltage controlling method of clock and data recovery circuit, optical receiver, and decision threshold voltage control program
Decision threshold voltage control circuit and decision threshold voltage controlling method of clock and data recovery circuit, optical receiver, and decision threshold voltage control program
According to a decision threshold voltage controlling method of feeding an optimum decision threshold voltage to a clock and data recovery circuit which converts an optical input signal into an electric signal, extracts a clock component from an input data signal amplified to a predetermined amplitude, and identifies 1 or 0 in the input data signal at a timing of the clock, three decision points are suitably controlled, by selectively performing a process of controlling the spaces of the three decision points, a process of moving the three decision points with their spaces kept as they are, and a process of changing an error pulse measurement time, depending on a measurement result of the error pulse.
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