A $2\times56$ Gb/s 0.78-pJ/b four pulse-amplitude modulation (PAM-4) single-ended multiple-input multiple-output (MIMO) crosstalk cancellation and signal reutilization (XTCR) receiver (RX) is investigated for medium-reach (MR) backplane communications. An XTCR scheme based on active crosstalk extraction (A-XTCR) is proposed to improve the signal reutilization efficiency of the RX. By adopting the proposed asymmetric-inductor current-mode logic (CML) single-ended-to-differential (S2D) converter, the pseudo-differential output mismatch is alleviated. Fabricated in 28-nm CMOS, the RX achieves a bit error rate (BER) of $< 1\text{e}\,\,-10$ at 56-Gb/s PAM-4 transmission with a channel of 24-dB Nyquist loss. Compared with the XTCR based on the conventional passive crosstalk extraction (P-XTCR), the proposed A-XTCR technique has improved vertical and horizontal eye openings of the RX by 24% and 15% at 56-Gb/s PAM-4, respectively. The result corresponds to the best energy efficiency of 0.78 pJ/b/lane, which compares favorably with the state of the art.

中文翻译：

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采用 28 nm CMOS 的主动串扰提取技术的 2×56 Gb/s 0.78 pJ/b PAM-4 串扰消除接收器


一个$2\次56$研究了 Gb/s 0.78pJ/b 四脉冲幅度调制 (PAM-4) 单端多输入多输出 (MIMO) 串扰消除和信号再利用 (XTCR) 接收器 (RX)，用于中距离 (MR ）背板通信。提出了一种基于主动串扰提取（A-XTCR）的XTCR方案来提高RX的信号重用效率。通过采用所提出的不对称电感器电流模式逻辑（CML）单端至差分（S2D）转换器，可以减轻伪差分输出失配。 RX 采用 28 nm CMOS 制造，误码率 (BER) 为$< 1\text{e}\,\,-10$ 56 Gb/s PAM-4 传输，通道奈奎斯特损耗为 24 dB。与基于传统无源串扰提取（P-XTCR）的XTCR相比，所提出的A-XTCR技术在56-Gb/s PAM-4下将RX的垂直和水平眼图开度分别提高了24%和15% 。结果相当于 0.78 pJ/b/lane 的最佳能源效率，与现有技术相比毫不逊色。