A ±4A High-Side Current Sensor with 25V Input CM Range and 0.9% Gain Error from -40°C to 85°C Using an Analog Temperature Compensation Technique

📋 论文概要

该论文提出了一种全集成±4A高侧电流传感器，支持25V输入共模电压范围，并采用1.5V单电源供电。通过使用超越电源轨的ADC和PTAT参考电压，解决了高侧电流传感中需要外部电阻分压器或电平移位器的问题，同时补偿了片上金属分流器的温度依赖性。

💡 主要创新点

• 采用超越电源轨的ADC实现高侧电流传感，无需外部电阻分压器或电平移位器，降低了功耗和系统复杂度。
• 利用PTAT参考电压补偿片上金属分流器的温度依赖性，在-40°C至85°C范围内实现0.9%的增益误差。

🏷 关键词

📄 原文摘要

This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without the need for external resistive dividers or level shifters, thus reducing power consumption and system complexity. To compensate for the shunt’s temperature dependence, the ADC employs a proportional-to-absolute-temperature (PTAT) reference voltage. Compared to digital temperature compensation schemes [2,3], this analog scheme eliminates the need for a temperature sensor, a band-gap voltage reference and calibration logic. As a result, the current sensor draws only 10.9μA and is 10× more energy efficient than [2]. Over a ±4A range, and after a one-point trim, the sensor exhibits

👥 作者与机构

Long Xu, Johan H. Huijsing, Kofi A. A. Makinwa

Delft University of Technology, Delft, The Netherlands