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A Fully Integrated Low-Power Hall-Based Isolation Amplifier With IMR Greater Than 120 dB

Seyed Sepehr Mirfakhraei, Yves Audet, Ahmad Hassan and Mohamad Sawan

Article (2022)

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Abstract

A CMOS Hall-based fully integrated isolation amplifier for differential voltage sensing is presented in this work. The design is fabricated in a 0.35 µm CMOS process in which the high voltage (HV) side of the amplifier contains a coil driver while the low voltage (LV) side includes a Hall-effect sensor, lownoise amplifier, programmable-gain amplifier, filter, and chopper switches. Another Hall sensor performs the digital isolation using the on-off keying (OOK) technique for clock recovery. The introduced prototype achieves above 120 dB of isolation mode rejection (IMR) at 60 Hz and operates at a continuous isolation working voltage of 0.6 kV. It has also a maximum nonlinearity of 0.64 %, an input-referred offset of 1 mV, a 40 dB full-scale signal-to-noise ratio over a 40 kHz bandwidth, and a spurious-free dynamic range of 64 dB. The silicon area for each of the two separate dices employed for the HV and LV side of the isolation amplifier is 1 mm² with a power consumption of 7.6 mW and 9.9 mW respectively. The achieved miniaturized size of the isolation components, as well as their significantly low-power consumption, ensure the suitability of the proposed isolation amplifier for multi-channel readout circuit applications.

Uncontrolled Keywords

Isolation amplifier; voltage sensing; current sensing; galvanic isolation; sensor interface; chopper amplifier; digital isolator; integrated spiral coil; CMOS Hall sensor

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
Department: Department of Electrical Engineering
Research Center: Polystim - Neurotechnology Laboratory
Funders: CRSNG/NSERC, MITACS, Design and Simulation Tools supported by the Canadian Microelectronics Corporation (CMC) Microsystems
PolyPublie URL: https://publications.polymtl.ca/50456/
Journal Title: IEEE Transactions on Circuits and Systems I: Regular Papers (vol. 69, no. 4)
Publisher: IEEE
DOI: 10.1109/tcsi.2021.3138301
Official URL: https://doi.org/10.1109/tcsi.2021.3138301
Date Deposited: 18 Apr 2023 14:59
Last Modified: 17 May 2023 07:46
Cite in APA 7: Mirfakhraei, S. S., Audet, Y., Hassan, A., & Sawan, M. (2022). A Fully Integrated Low-Power Hall-Based Isolation Amplifier With IMR Greater Than 120 dB. IEEE Transactions on Circuits and Systems I: Regular Papers, 69(4), 1385-1394. https://doi.org/10.1109/tcsi.2021.3138301

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