Papers › Ultra-low noise, bi-polar, programmable current sources
Ultra-low noise, bi-polar, programmable current sources
M. S. Mrozowski, I. C. Chalmers, S. J. Ingleby, P. F. Griffin, E. Riis
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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~mA and ±~250~mA respectively on three independent channels with 16-bit resolution. Both devices feature narrow 1/f noise bandwidth of 1~Hz, enabling magnetic field manipulation for high-performance OPMs. They exhibit low noise of 146.3~pA/√(Hz) and 4114~pA/√(Hz) which translates to 14.57~ppb/√(Hz) and 16.46~ppb/√(Hz) noise relative to full scale.
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