Research on an Ultra-low Noise Current Source and Its Measurement Method

LIU Mengyao; QIN Jianan; ZHENG Junting; JIANG Zhiyuan; XU Jinxin

doi:10.3969/j.issn.1000-1158.2026.03.16

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Acta Metrologica Sinica ›› 2026, Vol. 47 ›› Issue (3) : 442-448. DOI: 10.3969/j.issn.1000-1158.2026.03.16

Research on an Ultra-low Noise Current Source and Its Measurement Method

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Abstract

A bipolar current source combining ultra-low noise and a wide output range has been designed and implemented. The device delivers low-noise currents up to ±500 mA， with its performance characterized using a quantum sensor. To overcome the limitations imposed by amplifier noise and external interference， a noise characterization method based on a spin-exchange relaxation-free （SERF） atomic magnetometer is proposed. Experimental results demonstrate a noise spectral density of 3 nA/Hz^1/2 under various output conditions. Compared with existing current sources， the proposed design maintains stable low-noise operation across a significantly broader current range. Furthermore， the SERF magnetometer–based measurement system enables precise evaluation of noise current sources within the pA to nA range. This work provides a reliable technical solution for the development of ultra-low noise current sources and precision magnetic field measurements.

Key words

electrical measurement / ultra-low noise current source / current noise measurement / atomic magnetometer / spin-exchange relaxation-free

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LIU Mengyao , QIN Jianan , ZHENG Junting , et al . Research on an Ultra-low Noise Current Source and Its Measurement Method[J]. Acta Metrologica Sinica. 2026, 47(3): 442-448 https://doi.org/10.3969/j.issn.1000-1158.2026.03.16

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