← 返回 JSSC 论文列表JSSC 2021第7期RF & Wireless40nmEqualizerPAM-4
A 112-Gbs PAM-4 V oltage-Mode Transmitter With Four-Tap Two-Step FFE and Automat
一款采用四抽头两步FFE和自动相位对齐技术的112Gbs PAM-4电压模式发射器
112 Gb/s, 3.89-pJ/b
PAM-4电压模式发射器前馈均衡器自动相位对齐CMOS
▸创新点1：四抽头前馈均衡器（FFE）是一种电路创新，通过四抽头设计有效补偿信道损耗，提升信号完整性，支持112 Gb/s的高速传输。
▸创新点2：两步粗/细调谐技术是一种方法创新，通过分段优化FFE的权重系数，减少前端切片数量，同时保持高分辨率，降低设计复杂度。
▸创新点3：自动相位对齐技术是一种系统创新，集成于4:1多路复用器中，消除时序约束，移除重定时锁存器，显著降低功耗，提升能效至3.89 pJ/b。
▸创新点4：模拟阻抗控制环路是一种电路创新，实现输出阻抗匹配，确保粗/细FFE级之间的权重一致性，优化信号传输质量。
Abstract
This article presents a 112-Gb/s four-level pulse
amplitude modulation (PAM-4) voltage-mode transmitter (TX)
with a four-tap feed-forward equalizer (FFE). A two-step coarse-
/fine-tuning technique is adopted in the voltage-mode FFE to
reduce the number of front-end slices while maintaining suffi-
cient resolution. In addition, the device sizes in the preceding
multiplexer (MUX) and predriver can be enlarged, relaxing the
self-loading effect from the layout and improving the bandwidth.
An analog im