On-Chip Gain Reconfigurable 1.2V 24µW Chopping Instrumentation Amplifier with Automatic Resistor Matching in 0.13µm CMOS

📋 论文概要

本论文提出了一种工作在1.2V供电、仅消耗24µW功耗的全集成斩波仪表放大器。通过直接电流反馈结构和片上自动电阻匹配技术，实现了增益可重构并保证了低增益误差，适用于生物医学和能量采集等低电压低功耗应用。

💡 主要创新点

• 提出直接电流反馈（DCFB）结构，实现轨到轨输出摆幅并降低功耗。
• 采用自动电阻匹配技术，通过片上修调实现精确增益控制，抑制工艺、温度和失配影响。

🏷 关键词

📄 原文摘要

Motivated by low-voltage, low-power and small-size requirements of biomedical and energy scavenging circuits, this work introduces a fully integrated instrumentation amplifier (IA) running at 1.2V with a power consumption of only 24µW. A direct current feedback structure (DCFB) with rail-to-rail output swing is proposed along with a precision reference generation for on-chip resistor trimming (Fig. 21.8.1). Thus, gain reconfiguration is achieved while guaranteeing low gain error over mismatch, process and temperature variations. Many chopping instrumentation amplifiers are proposed using indirect current feedback (ICFB) [1] but they rely on a separate feedback transconductance (gm) pair at the input stage, which causes gm mismatch and sensitivity to input CM variation. Moreover, noise is increased since the input stage current has to be divided between the two gm pairs. Whereas an efficient calibration technique was

👥 作者与机构

Fridolin Michel, Michiel Steyaert

KU Leuven, Leuven, Belgium