23.3 A 51A Hybrid Magnetic Current Sensor with a Dual Differential DC Servo Loop and 43mArmsResolution in a 5MHz Bandwidth

Conference paper (2023)

Authors

Q. Fan Microelectronics
Mario Motz Infineon Technologies
Udo Ausserlechner Infineon Technologies
K.A.A. Makinwa Microelectronics
Department
Microelectronics
Copyright: © 2023 Amirhossein Jouvaeian, Q. Fan, Mario Motz, Udo Ausserlechner, K.A.A. Makinwa
DOI: https://doi.org/10.1109/ISSCC42615.2023.10067677
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Published Date

2023

Language

English

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Department

Microelectronics

Abstract

Magnetic current sensors are widely used in applications where galvanic isolation and wide bandwidth (BW) are desired, such as in switched-mode power supplies and motor drivers. By using Hall plates for low frequencies and pick-up coils for high frequencies, hybrid magnetic sensors can achieve high resolution (tens of textmA) over a wide frequency range (up to 15MHz) [1]-[3]. However, previous designs exhibit either poor gain flatness over frequency or limited energy efficiency. This work presents a hybrid magnetic current sensor that textachievespm 1. 1% gain flatness, which is 3times better than prior art [1]-[3]. Its energy efficiency is also 11times better than the state-of-the-art [1], [4], [5].

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