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Updated: Aug 30, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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A 2 MS/s Full Bandwidth Hall System with Low Offset Enabled by Randomized Spinning.

Robbe Riem1, Johan Raman1, Pieter Rombouts1

  • 1Department of Electronics and Information Systems, Ghent University, 9000 Ghent, Belgium.

Sensors (Basel, Switzerland)
|August 26, 2022
PubMed
Summary

A novel Hall plate readout uses a randomized spinning-current scheme to minimize offset errors. This innovation enables high-bandwidth Hall-based current sensors with significantly reduced residual offset.

Keywords:
Hall plateILSAcurrent spinningoffsetrandomized spinningspread-spectrum offset reduction loop (SS-ORL)

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Area of Science:

  • Electrical Engineering
  • Solid-State Physics

Background:

  • Hall plate sensors are crucial for current sensing.
  • Offset components limit the accuracy and bandwidth of Hall sensors.
  • Existing offset reduction techniques can interfere with in-band signals.

Purpose of the Study:

  • To propose a Hall plate readout scheme that maximizes offset component removal.
  • To enable high-bandwidth Hall-based current sensors.
  • To reduce residual offset without compromising in-band signals.

Main Methods:

  • A randomized four-phase spinning-current scheme for Hall plate readout.
  • Operation of offset-reduction loops in spread-spectrum mode.
  • Implementation of a mixed-mode experimental circuit with custom IC and FPGA.

Main Results:

  • Achieved a notch-free bandwidth of up to 820 kHz.
  • Measured a noise floor of 47 μTrms.
  • Reduced input-referred Hall plate offset from 130±22 μT to 23±22 μT.

Conclusions:

  • The proposed Hall plate readout effectively minimizes offset components.
  • Spread-spectrum offset reduction allows for a large notch-free bandwidth.
  • The technique is a key enabler for advanced, high-bandwidth Hall-based current sensors.