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Journal of Sensors
Volume 2016, Article ID 5625607, 16 pages
http://dx.doi.org/10.1155/2016/5625607
Research Article

Hall Effect Devices with Three Terminals: Their Magnetic Sensitivity and Offset Cancellation Scheme

Infineon Technologies AG, 9500 Villach, Austria

Received 6 January 2016; Accepted 6 March 2016

Academic Editor: Andreas Schütze

Copyright © 2016 Udo Ausserlechner. 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.

Abstract

This paper discusses properties of Hall effect sensors with only three terminals and compares them to conventional four-terminal devices. It covers both Horizontal and Vertical Hall effect devices. Their Hall-geometry factor is computed analytically. Several modes of operation are proposed and their signal-to-noise ratio is compared. A six-phase offset cancellation scheme is developed. All theoretical results are checked by measurements. The residual offset of Vertical Hall effect devices with three contacts is found to be smaller than the offset of conventional Vertical Hall effect devices with five contacts.