This paper presents an ultra-stable current source tailored for the one-mode, two-phase (OMTP) measurement scheme in Tsinghua tabletop Kibble balances. To achieve simultaneous high resolution and nA/A-level stability, a composite 'coarse-fine' control topology is proposed, utilizing a dual-DAC architecture and an active digital feedback loop. Experimental results show that the Allan deviation reaches 1 nA/A at an integration time of approximately 3 minutes, representing a tenfold improvement in measurement speed compared to commercial-source-based setups. Furthermore, the design offers a significant cost advantage, providing a satisfying option for high-precision, cost-effective mass realization.
@article{arxiv.2605.16833,
title = {Design and Verification of a New Current Source for Tsinghua Tabletop Kibble Balance},
author = {Yuhan Ma and Kang Ma and Wei Zhao and Lisha Peng and Songling Huang and Shisong Li},
journal= {arXiv preprint arXiv:2605.16833},
year = {2026}
}