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Sensors 2017, 17(1), 126; doi:10.3390/s17010126

A Distance Detector with a Strip Magnetic MOSFET and Readout Circuit

Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Nian X. Sun, Ming Liu and Menghui Li
Received: 17 November 2016 / Revised: 27 December 2016 / Accepted: 4 January 2017 / Published: 10 January 2017
(This article belongs to the Special Issue Magnetoelectric Heterostructures and Sensors)
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Abstract

This paper presents a distance detector composed of two separated metal-oxide semiconductor field-effect transistors (MOSFETs), a differential polysilicon cross-shaped Hall plate (CSHP), and a readout circuit. The distance detector was fabricated using 0.18 μm 1P6M Complementary Metal-Oxide Semiconductor (CMOS) technology to sense the magnetic induction perpendicular to the chip surface. The differential polysilicon CSHP enabled the magnetic device to not only increase the magnetosensitivity but also eliminate the offset voltage generated because of device mismatch and Lorentz force. Two MOSFETs generated two drain currents with a quadratic function of the differential Hall voltages at CSHP. A readout circuit—composed of a current-to-voltage converter, a low-pass filter, and a difference amplifier—was designed to amplify the current difference between two drains of MOSFETs. Measurements revealed that the electrostatic discharge (ESD) could be eliminated from the distance sensor by grounding it to earth; however, the sensor could be desensitized by ESD in the absence of grounding. The magnetic influence can be ignored if the magnetic body (human) stays far from the magnetic sensor, and the measuring system is grounded to earth by using the ESD wrist strap (Strap E-GND). Both ‘no grounding’ and ‘grounding to power supply’ conditions were unsuitable for measuring the induced Hall voltage. View Full-Text
Keywords: distance detector; Hall effect; strip MAGFET; polysilicon cross-shaped Hall plate; magnetic sensor; readout circuit; difference amplifier; instrumentation amplifier distance detector; Hall effect; strip MAGFET; polysilicon cross-shaped Hall plate; magnetic sensor; readout circuit; difference amplifier; instrumentation amplifier
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sung, G.-M.; Lin, W.-S.; Wang, H.-K. A Distance Detector with a Strip Magnetic MOSFET and Readout Circuit. Sensors 2017, 17, 126.

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