Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.
Rev Sci Instrum. 2023 Jan 1;94(1):014701. doi: 10.1063/5.0114760.
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.
我们介绍了两种配置的完全开源、超低噪声可编程电流源系统的设计过程和实现。虽然最初设计为光泵磁力计（OPM）的线圈驱动器，但该设备的规格使其在一系列应用中具有潜在的用途。这些设备在三个独立通道上具有双向电流范围为±10 和±250 mA，分辨率为 16 位。这两个设备都具有 1 Hz 的窄 1/f 噪声带宽，能够实现高性能 OPM 的磁场控制。它们的噪声低至 146 pA/Hz 和 4.1 nA/Hz，相对于满量程分别转换为 15 和 16 ppb/Hz 的噪声。
