A testing platform for frequency response characteristics of linear Hall sensors

Abstract

Linear Hall sensors are widely used to measure magnetic field strength, but there are few studies on the dynamic response characteristics of Hall sensors. To tackle this issue, a testing platform for the frequency response characteristics of linear Hall sensors was built, which was composed of a controllable constant current source, coils, linear Hall sensors, a low noise amplifier, and a data acquisition device. The system transfer function was constructed and a method of dynamically updating the transfer function was proposed, which realizes the accurate measurement of the dynamic response characteristics of Hall sensors. The dynamic characteristics of NHE520F and P3A were tested on this platform. The results showed that the performance differences in amplitude-frequency and phase-frequency characteristics of these Hall sensors in the range of 2.5 kHz-2 MHz were fully reflected on this testing platform. The dynamic characteristic parameters of Hall sensors were not necessarily consistent with the static characteristic parameters of Hall sensors, and the distributions of dynamic characteristics were also different. Additionally, according to the amplitude-frequency and phase-frequency characteristics of Hall sensors measured under various temperature and humidity conditions, the average dynamic characteristic curves and three standard deviation envelope curves of Hall sensors were plotted. The data obtained by this testing platform are of great significance for the research of dynamic response characteristics of Hall sensors.

Keywords

Hall sensor / magnetic field measurement / amplitude-frequency characteristics / phase-frequency characteristics

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