| 摘要 |
A pulse pattern generator ( 11 ) has a pulse generating unit ( 12 ) and a lowpass filter ( 14 ), and the pulse generating unit ( 12 ) includes an amplitude-value setting unit ( 13, 13 a). The pulse generating unit ( 12 ) generates a pulse signal formed in a step-like wave in which at least one of rise and fall of a signal is changed in a step-like manner. The lowpass filter ( 14 ) smoothes the pulse signal generated by the pulse generating unit ( 11 ), and outputs a smoothed pulse signal. The amplitude-value setting unit ( 13, 13 a) adjusts an amplitude value of a step-like wave that forms the pulse signal in order to set a shape of an eye waveform based on a setting value when an eye pattern of the output from the lowpass filter ( 14 ) is formed. The pulse pattern generator ( 11 ) can output the pulse signal having a desired pulse pattern having the predetermined eye closure from the lowpass filter ( 14 ).
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