面向芯粒间互连的低功耗发射机驱动设计

计算机工程与科学 ›› 2024, Vol. 46 ›› Issue (04): 599-605.

面向芯粒间互连的低功耗发射机驱动设计

任博琳，肖立权，齐星云，张庚，王强，罗章，庞征斌，徐佳庆

（国防科技大学计算机学院，湖南长沙 410073）

收稿日期:2023-09-12 修回日期:2023-11-19 接受日期:2024-04-25 出版日期:2024-04-25 发布日期:2024-04-17
基金资助:
国家重点研发计划（2022YFB4401504）

A low-power transmitter driver for die to die

REN Bo-lin,XIAO Li-quan,QI Xing-yun,ZHANG Geng,WANG Qiang,LUO Zhang,PANG Zheng-bin,XU Jia-qing

(College of Computer Science and Technology，National University of Defense Technology,Changsha 410073,China)

Received:2023-09-12 Revised:2023-11-19 Accepted:2024-04-25 Online:2024-04-25 Published:2024-04-17

摘要/Abstract

摘要： 面向UCIe协议提出的芯粒间互连标准，设计与实验了一种面向芯粒（Chiplet）间互连的低功耗发射机驱动。该驱动电路采用了SST电压模驱动器，功耗仅为CML电流模驱动器结构的1/4。此外，该驱动电路基于可调前馈均衡技术，针对不同的信道衰减调整均衡强度，采用去加重均衡的方式提高发射信号质量，最终降低码间干扰。本文设计采用CMOS 28 nm工艺设计，前端仿真结果表明，在0.9 V电压供电时，最大均衡强度为-3.7 dB，当32 Gbps的NRZ信号通过21 mm的信道时（16 GHz奈奎斯特频率处衰减为-2.37 dB），选择合适均衡强度后，输出波形眼图眼高为253 mV（71.8%），眼宽为27 ps（87%），仿真功耗仅为4.0 mW。

关键词: 芯粒, 前馈均衡器, SST驱动器, 高速接口电路, 发射机

Abstract: A low-power transmitter driver for chiplet interconnection was designed and experimentally implemented based on the inter-chip interconnection standard proposed by the UCIe protocol. The driver circuit adopts a source series terminated (SST) driver, whose power consumption is only 1/4 that of the current mode logic (CML) structure. In addition, based on adjustable feedforward equalization technology, the driver circuit adjusts the equalization strength for different channel attenuations. By de-emphasizing equalization, it enhances the quality of the transmitted signal, ultimately reducing inter-symbol interference. This circuit was designed under CMOS 28 nm process. The front-end simulation results show that the maximum equalization intensity is -3.7 dB when the 0.9 V voltage is supplied. When the 32 Gbps NRZ signal passes through the 21 mm channel (the attenuation at the 16 GHz Nyquist frequency is -2.37 dB), after adjusting the appropriate equalization intensity, the eye height of the output waveform eye diagram is 253 mV (71.8%), the eye width is 27 ps (87%), and the simulation power consumption is only 4.0 mW.

Key words: Chiplet, feedforward equalizer(FFE), source series terminated(SST) driver, serDes, transmitter

任博琳, 肖立权, 齐星云, 张庚, 王强, 罗章, 庞征斌, 徐佳庆. 面向芯粒间互连的低功耗发射机驱动设计[J]. 计算机工程与科学, 2024, 46(04): 599-605.

REN Bo-lin, XIAO Li-quan, QI Xing-yun, ZHANG Geng, WANG Qiang, LUO Zhang, PANG Zheng-bin, XU Jia-qing. A low-power transmitter driver for die to die[J]. Computer Engineering & Science, 2024, 46(04): 599-605.