A Sub-1V 14b 5.8nW/Hz BW/Power-Scalable CT Sensor Interface with a Frequency-Controlled Current Source Achieving a 225× Scalable Range

📋 论文概要

本文提出了一种亚1V、14位、带宽/功率可扩展的连续时间传感器接口，通过频率控制电流源实现了225倍的带宽/功率缩放比，解决了离散时间ADC中kT/C噪声限制的问题。该接口适用于物联网中的微弱信号数字化应用。

💡 主要创新点

• 提出频率控制电流源技术，实现带宽与功率的线性缩放，缩放比达225倍。
• 采用连续时间架构，避免了离散时间ADC中的kT/C噪声问题。
• 在亚1V电源电压下实现14位分辨率，同时保持低功耗和高能效。

🏷 关键词

📄 原文摘要

Vango Technologies, Hangzhou, China 1 2 Precision and energy-efficient sensor interfaces have always been needed in IoT applications. To digitize weak signals (tens of mVs), such as shunt-based current and biomedical sensors, the interface should have low noise [1-4]. Moreover, to accommodate different use cases, the bandwidth (BW) and power dissipation of sensor interfaces should be highly scalable [5-7]. Sensor interfaces based on discrete-time (DT) ADCs, such as SAR ADCs [8,9] and FIA-based ∆Σ ADCs [5-7] are BW/power scalable, but they usually suffer from kT/C noise (Fig. 27.3.1 top, left). Using a continuous-time (CT) first stage, such as an instrumentation amplifier (IA) [1,3,4] (Fig. 27.3.1 top, right), or an active RC integrator [10,11], can suppress the sampling noise of the following stages, however, they usually consume fixed static power, limiting their BW/power scalability. This work presents an energy-efficient CT-sensor interface based on a Gm-C ∆Σ modulator

👥 作者与机构

Xinjie Wu1, Yuyan Liu2, Xiaopeng Yu1, Nick Nianxiong Tan2, Zhong Tang2

Zhejiang University, Hangzhou, China