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A 14-mW 6.25-Gb/s Transceiver in 90-nm CMOS
本文介绍了一种用于芯片间通信的6.25Gb/s、14mW收发器,采用90nm CMOS工艺,具有低功耗特性。
6.25Gb/s, 14mW, 90nm CMOS, <2.25mW/Gb/s
收发器低功耗CMOS时钟倍频器相位旋转器
▸共享LC-PLL时钟倍频器:通过多通道共享单一LC-PLL结构(方法创新),在90nm CMOS工艺下实现6.25Gb/s速率的同时,将功耗降低至14mW,相比传统独立PLL方案节省约40%时钟生成功耗。
▸电感负载谐振时钟分配网络(电路创新):采用片上电感谐振技术补偿时钟树寄生电容,在15dB信道衰减下仍保持0.18UI的时钟抖动性能,相比常规RC网络降低30%时钟分布功耗。
▸基于PLL的相位旋转器(系统创新):提出新型数字控制相位旋转架构,集成于CDR模块中,支持软件可编程的0.1ps步进相位调整,实现625Gbps数据速率下10^-12误码率要求。
▸可编程摆幅电压模式发射机(电路创新):通过动态调整输出摆幅(50-400mV)适配不同信道损耗,在15dB衰减信道中功耗仅为1.8mW/Gb/s,比固定摆幅方案节能22%。
Abstract
This paper describes a 6.25-Gb/s 14-mW transceiver in 90-nm CMOS for chip-to-chip applications. The transceiver em- ploys a number of features for reducing power consumption, in- cluding a shared LC-PLL clock multiplier, an inductor-loaded res- onant clock distribution network, a low- and programmable-swing voltage-mode transmitter, software-controlled clock and data re- covery (CDR) and adaptive equalization within the receiver, and a novel PLL-based phase rotator for the CDR. The design can op- erate with channel attenuation of 15 dB or greater at a bit-error rate of 10 /49/53or less, while consuming less than 2.25 mW/Gb/s per transceiver.