JSSC 2011第10期Data ConvertersDAC

Ultrahigh-Speed Low-Power DACs Using InP HBTs for Beyond-100-Gbsch Optical Trans

介绍两种基于InP HBT的超高速低功耗6位DAC，用于超100Gb/s/ch光传输系统。

32 GS/s, 1.4W; 28 GS/s, 0.95W, 0.53 pJ/step

超高速DAC低功耗InP HBT光传输系统QAM传输

▸创新点1：采用双采样技术缓解速度限制，通过R-2R梯形电流导向架构实现超高速操作，采样速度高达32 GS/s，显著提升DAC性能。

▸创新点2：新型时序对齐技术，优化DAC时序控制，采样率达28 GS/s，功耗仅0.95 W，实现卓越的转换效率（0.53 pJ/转换步）。

▸创新点3：提供清晰多级调制信号用于QAM传输，支持超100 Gb/s/ch光传输系统，增强信号质量和传输效率。

▸创新点4：基于InP HBTs的低功耗设计，结合双采样和时序对齐技术，显著降低系统功耗，提升整体能效。

Abstract

This paper presents the circuit designs and mea- sured performance of two ultrahigh-speed low-power 6-b digital-to-analog converters ( DACs) using InP-based hetero- junction bipolar transistors (HBTs) for beyond-100-Gb/s/ch optical transmission systems. The ﬁrst design is based on an R-2R ladder-based current-steering architecture with a novel double-sampling technique that relaxes the speed restraints for the DAC and helps achieve ultrahigh-speed operation. The DAC with the double-sampling tec