Mismatch and Offset-Voltage Compensation Technique for Current Excitation Based Resistive Sensors Interface

Mushtaq, M., Wani, M. I., Saquib, S., Ahmad, M., Somappa, L., Baghini, M. S., Heidari, H. and Malik, S. (2023) Mismatch and Offset-Voltage Compensation Technique for Current Excitation Based Resistive Sensors Interface. In: 21st IEEE Interregional NEWCAS Conference (IEEE NEWCAS 2023), Edinburgh, UK, 26-28 June 2023, ISBN 9798350300246 (doi: 10.1109/NEWCAS57931.2023.10198102)

Abstract

Resistive sensors have been increasingly used in a number of wearable biomedical applications ranging from prosthetic control to electronic skin, thanks to their miniaturized size. However, most resistive sensor systems suffer thermoelectric offset, large baseline resistance, and drift in baseline resistance. In addition, the system should be battery-operated and consume low power. In this paper, we present a pulse current excitation-based half-bridge mixed-signal interface circuit for accurate and high-resolution resistance measurement of resistive sensors. The circuit utilizes synchronous demodulation and a DC-Servo loop to compensate for the offset and mismatch to enhance the accuracy and measurement range. The circuit provides a linear output voltage proportional to the incremental change in sensor resistance. A prototype of the proposed system is developed and tested. The circuit compensates offset-voltage as high as ± 1.4 Volts and the resistance mismatch up to 100 kΩ for a supply voltage of 3.3 Volts with an error of less than ± 1%.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ahmad, Mr Meraj and Heidari, Professor Hadi
• Authors: Mushtaq, M., Wani, M. I., Saquib, S., Ahmad, M., Somappa, L., Baghini, M. S., Heidari, H., and Malik, S.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• ISSN: 2474-9672
• ISBN: 9798350300246
• Copyright Holders: Copyright © 2023 IEEE
• First Published: First published in 2023 21st IEEE Interregional NEWCAS Conference (NEWCAS)
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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