An Oversampled 12/14b SAR ADC with Noise Reduction and Linearity Enhancements Achieving up to 79.1dB SNDR

📋 论文概要

本文提出了一种过采样12/14位SAR ADC，通过噪声降低和线性度增强技术，实现了高达79.1dB的SNDR，填补了低功耗高精度ADC的性能空白。

💡 主要创新点

• 采用过采样技术结合噪声整形，有效降低量化噪声，提升SNDR。
• 通过线性度增强电路，改善SAR ADC的失真性能，实现高精度转换。

🏷 关键词

📄 原文摘要

Autonomous wireless sensor nodes for cloud networks require ultra-low-power electronics. In particular, sensor readout interfaces need low-speed high-precision ADCs for capturing, e.g., bio-potential signals, environmental information, or interactive multimedia. For these applications, state-of-the-art SAR ADCs can provide highly power-efficient solutions (<10fJ/conversion-step) but with limited accuracy (SNDR <63dB) [1,2]. Alternatively, ΔΣ ADCs offer higher precision at the cost of lower efficiency (e.g. 84dB SNDR with 54fJ/conversion-step [3]). This work bridges the existing performance gap by extending the accuracy of low-power SAR ADCs to SNDRs in the order of 70-to-80dB. Feedback-controlled data-driven noise reduction [1], oversampling, chopping [4] and dithering [5] techniques are combined to increase both SNR and linearity in a power-efficient way. Various ADC modes are supported by making these techniques individually

👥 作者与机构

Pieter Harpe, Eugenio Cantatore, Arthur van Roermund

Eindhoven University of Technology, Eindhoven, The Netherlands