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该论文提出了一种基于单放大器EF-CIFF结构的3阶噪声整形SAR ADC，通过全动态硬件复用技术实现了高能效和高分辨率。解决了高阶噪声整形带来的功耗和面积开销问题，在0.4pF输入电容下达到了13.8-ENOB的性能。
Noise-shaping SAR (NS-SAR) ADCs are attracting rising attention for their low-power high-resolution capability. In most recent arts, a substantial focus is placed on improving the loop filter design by using techniques such as passive SC and dynamic amps (DAs) [1-2]. While some demonstrate power efficiency reaching 180dB FoMs with mediumhigh ENOB (~13), NS-SARs targeting >13-ENOB needs have yet to attain this leading efficiency. It calls for further efforts in two key aspects when pushing for higher ENOB. The first is to realize high-order (≥3) NS without significant overhead, so it can use a low OSR and avoid excess digital power. Recent work reports a 4th-order NS-SAR by cascading two 2nd-order EF structures, showing better simplicity over classic single-loop designs [3]. However, the use of static amps keeps power high. Also, due to the fact that its residue voltages (VRES) contain the DC offsets from the comparator/amp, the
Tzu-Han Wang, Ruowei Wu, Vasu Gupta, Shaolan Li
Georgia Institute of Technology, Atlanta, GA