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)
Author(s)

Z. Tang (TU Delft - Electronic Instrumentation)

Nandor G. Toth (TU Delft - Electronic Instrumentation)

R.L. Zamparette (TU Delft - Electronic Instrumentation)

Tomohiro Nezuka (MIRISE Technologies)

Yoshikazu Furuta (MIRISE Technologies)

Kofi A. A. Makinwa (TU Delft - 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 related publication
https://doi.org/10.1109/ISSCC42615.2023.10067304
More Info
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Publication Year
2023
Language
English
Copyright
© 2023 Z. Tang, N.G. Toth, R.L. Brito Zamparette, Tomohiro Nezuka, Yoshikazu Furuta, K.A.A. Makinwa
Research Group
Electronic Instrumentation
Pages (from-to)
348-350
ISBN (electronic)
9781665428002
Reuse Rights

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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.

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