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本文提出了一种采用眼图监测反馈的40Gb/s CDR电路，通过自适应决策点控制来补偿波形失真、延迟失配和电压偏移，从而解决眼图非最优位置导致的误码率退化问题。
the CDR circuit is not often the optimum position of the eye diagram. For example, asymmetrical waveform distortion, internal delay mismatch, or internal voltage offset causes the misalignment of the decision point in the vertical and/or horizontal directions. Furthermore, this misalignment sometimes rapidly and randomly varies over time. To overcome a severe degradation of BER performance due to this misalignment, a 40Gb/s CDR circuit integrated with an adaptive decision-point control scheme by using an eye-opening monitor [1–3] feedback is developed. The key approaches are follows: 1) a 40Gb/s high-precision eye-opening monitor (EOM) circuit to detect an optimum decision point, 2) an adaptive decision-point
Hidemi Noguchi1, Nobuhide Yoshida1, Hiroaki Uchida2,
Manabu Ozaki2, Shunichi Kanemitsu2, Shigeki Wada1 1 NEC, Kanagawa, Japan NEC Engineering, Kanagawa, Japan 2 In high-speed data link systems of over 40Gb/s, the data decision point in