Ultra-low noise, bi-polar, programmable current sources

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We present the design process and implementation of fully open-source, ultra-low noise programmable current source systems in two configurations. Although originally designed as coil drivers for Optically Pumped Magnetometers (OPMs), the device specifications make them potentially useful in a range of applications. The devices feature a bi-directional current range of ±10 and ±250 mA on three independent channels with 16-bit resolution. Both devices feature a narrow 1/f noise bandwidth of 1 Hz, enabling magnetic field manipulation for high-performance OPMs. They exhibit a low noise of 146 pA/√Hz and 4.1 nA/√Hz, which translates to 15 and 16 ppb/√Hz noise relative to full scale.
Original languageEnglish
Article number014701
Number of pages9
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 3 Jan 2023


  • low noise
  • instrumentation
  • current sources
  • optically pumped magnetometer (OPM)
  • electronics
  • analog circuits


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