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. 2023 Jan 1;94(1):014701.
doi: 10.1063/5.0114760.

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

M S Mrozowski  1 , I C Chalmers  1 , S J Ingleby  1 , P F Griffin  1 , E Riis  1
Affiliations
Free article

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

M S Mrozowski et al. Rev Sci Instrum. .
Free article

Abstract

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.

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