A Calibration-Free 71.7dB SNDR 100MS/s 0.7mW Weighted-Averaging Correlated Level Shifting Pipelined SAR ADC with Speed-Enhancement Scheme

📋 论文概要

本文提出了一种加权平均相关电平移位（WACLS）技术，用于流水线SAR ADC，无需校准即可理论上消除有限运放增益误差，并采用速度增强方案克服速度下降问题。实现了71.7dB SNDR、100MS/s采样率、0.7mW功耗的高能效性能。

💡 主要创新点

• 提出加权平均相关电平移位（WACLS）技术，无需校准即可消除流水线SAR ADC中有限运放增益误差。
• 采用速度增强方案，克服了WACLS技术可能带来的速度下降问题。
• 实现了高能效的流水线SAR ADC，在100MS/s下功耗仅0.7mW，SNDR达71.7dB。

🏷 关键词

📄 原文摘要

With the increasing demand for next-generation communication, the trend of developing wide-bandwidth, high-resolution ADCs has emerged, where pipelined SAR (PIPE-SAR) ADCs [1-2] have become popular owing to their excellent powerefficiency due to the fewer number of opamps. However, the finite opamp gain error limits the resolution of PIPE-SAR ADCs. Without calibration, this work proposes the weighted-averaging correlated level shifting (WACLS) technique for PIPE-SAR ADCs to theoretically eliminate the finite opamp gain error and operate with a speed-enhancement scheme to overcome the speed-degradation drawback of the prior two-phase CLS-based residue amplification [3-4]. In addition, a dutycycle-controlled ring amplifier (ringamp) with quick start-up is proposed for power saving. Figure 16.4.1 shows the 14b PIPE-SAR ADC comprising a 6b 1st-stage SAR ADC, a 32×-gain residue amplifier (RA), and a 9b 2nd-stage SAR ADC with 1b

👥 作者与机构

Tsung-Chih Hung, Jia-Ching Wang, Tai-Haur Kuo

National Cheng Kung University, Tainan, Taiwan