Two papers at the Journal of Physics!
Two papers from the CONNECT consortium have been published at the Journal of Physics!
The first paper entitled “Bandwidth enhancement in Hall probe by X-Hall DC biasing” by M Crescentini, M Biondi, M. Marchesi, A. Romani, M Tartagni and P A Traverso, deals with the spinning-current technique, which is the state-of-the-art method for offset cancellation in Hall-effect probe. This technique achieves the best results in terms of offset reduction but limits the acquisition bandwidth to less than 1 MHz; therefore, it precludes the use of purely Hall-effect sensors in broadband current measurement. This paper presents the X-Hall probe, a DC bias approach combined with an octagonal 8-contact morphology of the Hall-effect probe, which overcomes the bandwidth limitations of spinning-current-operated Hall sensors while reducing the offset. A prototype of the X-Hall probe is realized in CMOS-like technology and can potentially achieve a bandwidth wider than 40 MHz with an acceptable residual offset.
The second paper entitled “an empirical dynamic model of Hall-effect sensors” by M Crescentini and P A Traverso, presents an empirical, equivalent, dynamic model of Hall-effect sensors that is based on a parallel circuit composed of a controlled current generator, a resistor, and a capacitor. This solution provides optimal description of the dynamic response of the probe and easily takes into account the loading and parasitic capacitive effects. The proposed model is verified against empirical AC measurements to demonstrate the quality of the model in dynamic conditions.