23.2 A 40 A Shunt-Based Current Sensor with ±0.2% Gain Error from -40°C to 125°C and Self-Calibration

Conference paper (2023)

Authors

Zhong Tang Electronic Instrumentation
N.G. Toth Electronic Instrumentation
R.L. Brito Zamparette Electronic Instrumentation
Tomohiro Nezuka MIRISE Technologies
Yoshikazu Furuta MIRISE Technologies
K. A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation
Copyright: © 2023 Z. Tang, N.G. Toth, R.L. Brito Zamparette, Tomohiro Nezuka, Yoshikazu Furuta, K.A.A. Makinwa
DOI: https://doi.org/10.1109/ISSCC42615.2023.10067304
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Published Date

2023

Language

English

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Research Group

Electronic Instrumentation

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.

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