A 20 Gb/s/pin 1.18pJ/b 1149µm2 Single-Ended Inverter-based 4-tap Addition-Only Feed-Forward Equalization Transmitter with Improved Robustness to Coefficient Errors in 28nm CMOS

📋 论文概要

提出了一种基于反相器的单端4抽头前馈均衡发射机，用于DRAM接口，实现了20 Gb/s/pin的数据率、1.18pJ/b的能效和1149µm²的面积。通过匹配远端端接50Ω改善信号完整性，并采用加法-only结构简化电路。

💡 主要创新点

• 采用单端反相器基的4抽头前馈均衡（AFFE）结构，实现加法-only操作，降低复杂度和功耗。
• 通过匹配远端终端50Ω的方法提升反相器电压摆幅，改善信号完整性。
• 利用动态锁存器的半速率移位寄存器和简单数字门解码块，提高面积和能效。

🏷 关键词

📄 原文摘要

matching method [3], the signal integrity problems are resolved by matching the farend terminal to 50Ω. This technique can improve the voltage swing of the inverters. The half-rate digital inputs are serialized by the re-timing 2:1 MUXs and then fed to the AFFE TX summing drivers. While the inputs (Do1 and De1) of the main tap is directly fed from the shift register, the inputs to the other taps are generated by the decoding blocks, which are composed of simple digital gates. The half-rate shift register uses dynamic latches for area and power efficiency. This paper presents an inverter-based 4-tap addition-only feed forward equalization (FFE) transmitter (TX) for compact and power-efficient single-ended memory interfaces. Area and power efficiencies of I/Os are increasingly important as I/Os are becoming faster, more complex, and larger; whereas, the area and power budget is limited. Source-series

👥 作者与机构

Changjae Moon, Jaeyoung Seo, Myungguk Lee, Iksu Jang, Byungsub Kim