| 摘要 |
A common mode of a waveform of a duobinary transmission signal (IN) is set to 0 and the size of a data eye is set to Veye; and reference potentials Vref_H and Vref_L are set to the following values: Veye/√{square root over (3)}≦̸Vref—H≦̸Veye/√{square root over (2)}  (1) −Veye/√{square root over (2)}≦̸Vref—L≦̸−Veye/√{square root over (3)}  (2) More particularly, effect becomes remarkable by setting the reference potentials Vref_H and Vref_L to central values in ranges shown in Equations (1) and (2), respectively. In the central values, fluctuation (jitter) of transition data becomes the smallest, and a jitter characteristic of a reproducing clock becomes the best. Consequently, a clock reproducing apparatus in which a received clock from duobinary transmission data is reproduced with high accuracy is provide.
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