23.2 A 40 A Shunt-Based Current Sensor with ±0.2% Gain Error from -40°C to 125°C and Self-Calibration
Zhong Tang (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Nandor G. Toth (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Roger Zamparette (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Tomohiro Nezuka (MIRISE Technologies)
Yoshikazu Furuta (MIRISE Technologies)
Kofi A.A. Makinwa (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
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 circC) 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 (I textREF) source for shunt self-calibration. By employing a continuous-time (CT) front-end, it achieves an input noise density of 14textnV/sqrttextHz while consuming only 280mu A, making it > 10times more energy efficient than prior art [1], [2], with comparable gain error (pm0.2%) over a wider current (pm 40A) and temperature (-40 circC to 125 circC) range.