← 返回 JSSC 论文列表JSSC 2022第9期Data Converters40nmFlash ADCDAC
A 7-Bit Two-Step Flash ADC With Sample-and-Hold Sharing Technique Dong-Ryeol Oh
一种采用采样保持共享技术的7位两步式闪存ADC,具有高带宽和低功耗特性。
40nm CMOS, 0.9V, 3GS/s
两步式闪存ADC时间交错带宽扩展功耗优化偏移校准
▸创新点1:参考嵌入闪存ADC技术(电路创新)。通过仅在精细阶段使用单个电容性DAC,显著提高了功率效率和面积效率,同时扩展了输入带宽,实现了更高的系统性能。
▸创新点2:采样保持共享结构(系统创新)。该结构消除了精细ADC输入电容的影响,提升了输入带宽,并消除了粗ADC与精细ADC之间的增益误差,优化了整体系统精度。
▸创新点3:斜率匹配偏移校准技术(方法创新)。在八倍插值的精细ADC中,采用先进的顺序斜率匹配校准技术,提高了电压-时间转换器的增益和插值线性度,显著改善了信号处理的准确性。
▸创新点4:时间交错技术(系统创新)。通过双通道时间交错设计,实现了3 GS/s的高采样率,并结合时间偏移校准,将有效分辨率带宽从4.8 GHz提升至7 GHz,显著提升了ADC的动态性能。
Abstract
A 7-bit 3 GS/s two-channel time-interleaved
two-step flash analog-to-digital converter (ADC) with 7-GHz
effective resolution bandwidth (ERBW) is presented. A reference-
embedding flash ADC for a fine stage having only a single capaci-
tive digital-to-analog converter improves the power efficiency and
area efficiency as well as the input bandwidth. The proposed
sample-and-hold sharing structure not only improves the input
bandwidth by removing the effect of the input capacitance
of the fine ADC (FADC)