In this article, a maximum-eye-tracking clock and data recovery (MET-CDR) circuits for minimum bit error rate (BER) are presented. The proposed CDR does not require a BER counter or an eye-opening monitor with any iterative procedure to find the optimal sampling phase. The biased data level obtained from the weighted sum of error sampler outputs provides the actual eye height (EH) information in the presence of precursor intersymbol interference (ISI). Two samplers operating on two slightly different timings detect the current EH and the polarity of the eye slope so that the CDR can track the maximum EH where the slope becomes zero. Measured results show that the sampling phase of the maximum EH and that of the minimum BER match well. A prototype receiver fabricated in 28-nm CMOS process operates at 26 Gb/s with an eye-opening of 0.25 unit interval (UI) and consumes 87 mW while equalizing 23.5 dB of loss at 13 GHz.

中文翻译：

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用于\textNear-Optimal Timing Adaptation 的具有偏置数据电平和眼图斜率检测器的最大眼动跟踪 CDR

在本文中，介绍了一种可实现最小误码率 (BER) 的最大眼动跟踪时钟和数据恢复 (MET-CDR) 电路。建议的 CDR 不需要 BER 计数器或具有任何迭代程序的开眼监视器来找到最佳采样相位。从误差采样器输出的加权总和中获得的有偏差的数据电平提供了存在前体符号间干扰 (ISI) 时的实际眼高 (EH) 信息。在两个稍微不同的时序上运行的两个采样器检测当前 EH 和眼图斜率的极性，以便 CDR 可以跟踪斜率变为零的最大 EH。实测结果表明，最大EH和最小BER的采样相位匹配良好。采用 28 纳米 CMOS 工艺制造的原型接收器以 26 Gb/s 的速度运行，眼开度为 0。