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本文提出一种基于金属分流器的电流传感器，可在-40°C至125°C宽温范围内实现±0.2%的增益误差，并具备自校准功能，解决了传统分流传感器高温下精度下降的问题。通过片上参考电流源和自校准技术，实现了低成本、高精度、宽温域的电流检测。
Yoshikazu Furuta2, Kofi A. A. Makinwa1 Delft University of Technology, Delft, The Netherlands MIRISE Technologies, Aichi, Japan 1 2 Low-cost metal (e.g., PCB trace) shunts can be used to make accurate current sensors (<1% gain error) [1-3]. However, their reported maximum operating temperature (85°C) is not high enough for automotive applications, and at higher temperatures, shunt resistance may exhibit increased drift, especially at high current levels. This paper presents a metal-shunt-based current sensor with a wide temperature range and a stable on-chip reference current (IREF) source for shunt self-calibration. By employing a continuous-time (CT) front-end, it achieves an input noise density of 14nV/$Hz while consuming only 280µA, making it >10× more energy efficient than prior art [1,2], with comparable gain error (±0.2%) over a wider current (±40A) and temperature (-40°C to 125°C) range.
Zhong Tang1, Nandor G. Toth1, Roger Zamparette1, Tomohiro Nezuka2,