A 115.2-dB Dynamic-Range Two-Step Direct-Conversion Front-End With Mismatch Error Shaping for Noninvasive Biomedical Devices

IF 2.2 Q3 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE

IEEE Solid-State Circuits Letters Pub Date : 2025-03-05 DOI:10.1109/LSSC.2025.3548453

Yuxuan Chen;Xianzhi Yang;Jiayi Lin;Zilong Liu;Min Zeng;Qi Wu;Mingyi Chen

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引用次数: 0

Abstract

This article presents a two-step direct-conversion front-end (Direct-FE) for noninvasive wearable biomedical devices. In the first step, a delta modulator (

$\Delta $

M) with embedded gain is used to implement coarse quantization, while in the second step, a discrete-time sigma delta modulator (DT-

$\Sigma \Delta $

M) is used to realize fine quantization. DC-coupled differential difference amplifier (DDA) with resistor-based digital-to-analog converter (RDAC) is adopted as the input stage. Mismatch error shaping (MES) with reduced silicon area is utilized to suppress the mismatch error of the RDAC. The prototype has been implemented in 0.18-

$\mu $

m BCD process and achieves a peak input range of

$7.64~{\mathrm {V}_{\mathrm {pp}}}$

, an input-referred-noise (IRN) of

$1.59~\mu \mathrm {V}_{\mathrm {RMS}}$

, a corresponding dynamic range (DR) of 115.2 dB, while consuming 2.4-mW power. The real physiological signals recording demonstrates its potential capability for wearable bio-potential acquisition, boosting the wearable and fitness application areas.

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用于非侵入性生物医学设备的具有失配误差整形的115.2 db动态范围两步直接转换前端

本文介绍了一种用于无创可穿戴生物医学设备的两步直接转换前端（Direct-FE）。第一步，采用内嵌增益的δ调制器（$\Delta $ M）实现粗量化，第二步，采用离散σ δ调制器（DT- $\Sigma \Delta $ M）实现细量化。采用直流耦合差分放大器（DDA）和基于电阻的数模转换器（RDAC）作为输入级。利用减小硅面积的失配误差整形（MES）来抑制RDAC的失配误差。该样机已在0.18- $\mu $ m BCD工艺中实现，峰值输入范围$7.64~{\mathrm {V}_{\mathrm {pp}}}$，输入参考噪声（IRN） $1.59~\mu \mathrm {V}_{\mathrm {RMS}}$，相应的动态范围（DR） 115.2 dB，功耗为2.4 mw。真实的生理信号记录显示了其潜在的可穿戴生物电位采集能力，推动了可穿戴和健身应用领域的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Solid-State Circuits Letters Engineering-Electrical and Electronic Engineering

CiteScore

4.30

自引率

3.70%

发文量