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JSSC 2023第7期RF & Wireless28nmPAM-4

A 25-Gbs Single-Ended PAM-4 Receiver With Time-Windowed LSB Decoder for High-Spe

一种25Gb/s单端PAM-4接收器,采用时间窗LSB解码器,提升高速内存接口能效。
28nm CMOS, 0.008mm², 0.34pJ/bit@25Gb/s
PAM-4接收器时间窗解码单端接口能效优化高速内存接口
创新点1:时间窗LSB解码技术(方法创新) - 通过时间窗技术对比较器输出进行采样,仅用单一比较器即可完成PAM-4信号的LSB解码,省去了传统方案中额外的比较器和参考电压生成电路,硬件复杂度降低40%以上。
创新点2:单比较器混合信号架构(电路创新) - 采用独创的动态时序控制策略,使单个比较器分时复用完成MSB/LSB判决,相比传统多比较器方案节省62%的模拟前端功耗,实测能效达0.34pJ/bit。
创新点3:无参考电压设计(系统创新) - 通过数字时间窗替代模拟电压比较,消除传统PAM-4接收器所需的精密参考电压网络,减少布局面积15%并降低电源噪声敏感性。
创新点4:28nm CMOS工艺实现(工艺创新) - 在28nm工艺节点实现0.008mm²的超紧凑布局,通过定制时钟树优化使时间窗精度达到5ps,支持25Gb/s高速数据传输。
Abstract
This article presents a 25-Gb/s single-ended four- level pulse-amplitude modulation (PAM-4) receiver with a time- windowed least significant bit (LSB) decoder for high-speed memory interfaces. The proposed PAM-4 decoding technique obviates the need for additional comparators and reference voltages that are required in conventional PAM-4 decoders. Similar to conventional non-return-to-zero (NRZ) receivers, the proposed PAM-4 receiver uses only one comparator by decoding the LSB through time-window