A 30MHz Wideband 92.7dB SNR 99.6% Accuracy Bioimpedance Spectroscopy IC Using Time-to-Digital Demodulation with Co-Prime Delay Locked Sampling

📋 论文概要

该论文提出了一款宽带生物阻抗频谱测量IC，采用时间数字解调与互质采样技术，将工作频率从传统的10MHz扩展到30MHz，实现了92.7dB SNR和99.6%的精度，解决了现有生物阻抗IC带宽不足的问题。

💡 主要创新点

• 采用时间数字解调与互质采样架构，突破传统生物阻抗IC的10MHz频率限制，实现30MHz宽带测量。
• 在30MHz带宽下同时实现92.7dB的高信噪比和99.6%的高精度，优于现有方案。
• 可能通过特殊的互质采样时间数字转换器设计，降低噪声并提高解调效率。

🏷 关键词

📄 原文摘要

The permittivity and conductivity of bioimpedance in tissues are governed by α, β, and γ dispersions, with biological features detectable in the tens of MHz range. Wideband spectroscopy is required in many applications including body fluid volume assessment [1], cancer diagnosis [2], anatomical characterization [3], and plant content estimation [4]. However, state-of-the-art bioimpedance ICs are limited to frequencies up to 10MHz, which hampers biological research.%For example, estimating starch content in cassavas requires wideband spectroscopy with frequencies up to 30MHz [4]. In a wideband system using analog I-Q demodulation, accuracy is limited by the large distortion from its multiplication process; a phase error of 4.32° at 10MHz was reported in [2]. In a wideband system using digital I-Q demodulation, a phase error of 0.15% at 10MHz was reported in [5] but at the expense of a large power consumption (12.2mW for the amplifier and ADC alone) and a

👥 作者与机构

Jiayang Li, Dai Jiang, Yu Wu, Andreas Demosthenous

University College London, London, United Kingdom