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

Mrozowski, M. S. and Chalmers, I. C. and Ingleby, S. J. and Griffin, P. F. and Riis, E. (2023) Ultra-low noise, bi-polar, programmable current sources. Review of Scientific Instruments, 94 (1). 014701. ISSN 0034-6748 (https://doi.org/10.1063/5.0114760)

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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.