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本文提出了一种免校准的时间交织四阶噪声整形SAR ADC，通过时间交织和四阶噪声整形技术，将NS-SAR ADC的带宽从MHz级提升至50MHz，同时实现了70.4dB的SNDR，解决了传统NS-SAR ADC带宽不足的问题，适用于无线通信等宽带应用。
Noise-Shaping SAR (NS-SAR) is an emerging ADC architecture that offers both high resolution and high energy efficiency. State-of-the-art NS-SAR ADCs eliminate the need for op-amps, which relaxes design complexity and technology scaling issues. However, existing NS-SAR ADCs, with high FoM, are limited in bandwidth [1,2] (typically in the MHz range). This makes NS-SAR ADCs unsuitable for applications that need bandwidths in the tens of MHz range, such as wireless communications. Traditionally, high-bandwidth, high-resolution applications utilize pipeline or continuous-time sigma-delta (CT-SD) ADCs, but these architectures are much more power hungry than the NS-SAR. Thus, to increase the bandwidth of NS-SAR ADCs and extend their low-power advantages, this work presents a new time-interleaved noise-shaping SAR (TINS-SAR) architecture that enables higher bandwidth. Although time-interleaving of ADCs is difficult for high
Lu Jie, Boyi Zheng, Michael P. Flynn
University of Michigan, Ann Arbor, MI