A 21.8b Sub-100μHz 1/f Corner 2.4μV-Offset Programmable-Gain Read-Out IC for Bridge Measurement Systems

📋 论文概要

本文提出了一款用于桥式测量系统的高分辨率可编程增益读出IC，采用新型低噪声放大器设计，实现了21.8b分辨率、亚100μHz的1/f拐点和2.4μV失调电压，解决了传统开关电容或多运放仪表放大器功耗-噪声折衷差的问题。

💡 主要创新点

• 提出了一种新型低噪声仪表放大器架构，通过数字辅助技术抑制1/f噪声，降低了功耗和噪声折衷。
• 实现了亚100μHz的1/f拐点，显著提升了直流测量系统的低频噪声性能。
• 集成了可编程增益功能，适应不同桥式传感器输出范围，同时保持高线性度和低失调。

🏷 关键词

📄 原文摘要

High-resolution read-out integrated circuits (ROICs) are often used in DC measurement systems such as bridge transducers. Since these typically output small-amplitude signals with a bandwidth of a few hertz, a highly linear gain ROIC is required with a resolution above 20b [1,2]. In previous work, high-precision instrumentation amplifiers (IAs) followed by analog-to-digital converters (ADCs) were reported [1-4]. However, IA topologies based on switched-capacitor (SC) or multiple operational amplifiers (opamps) suffer from a poor power-noise tradeoff due to noise folding [2], or the number of amplifiers [3], respectively. Current-feedback IAs (CFIAs) are more power-efficient, but require highly linear feedback resistors [4,5]. This drawback can be addressed by capacitively-coupled IAs (CCIAs), which are even more power efficient [1]. This paper describes a fully integrated 21.8b programmable-gain ROIC for DC

👥 作者与机构

Jaehoon Jun, Cyuyeol Rhee, Minsung Kim, Junho Kang, Suhwan Kim

Seoul National University, Seoul, Korea