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Development of a dc-SQUID Amplifier with Intra-Coil Resistors

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Abstract

We have developed a dc-SQUID amplifier with intra-coil resistors based on second-order parallel gradiometers. The measured results show that intra-coil resistors can significantly increase the flux–voltage transfer coefficient VΦ as well as smooth out resonances and produce a smooth flux–voltage (V–Φ) characteristic curve. It has been observed through a comparison of various intra-coil damping resistors that the flux–voltage transfer coefficient VΦ as a function of the resistance of the intra-coil resistors rises as the corresponding electrical conductance increases. The measured results of the flux noise at 4.2 K demonstrate explicitly that the flux–voltage transfer coefficient can greatly increase detection sensitivity and successfully reduce the noise contribution from the electronics operating at room temperature.

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Acknowledgements

We thank all the engineers working at the Superconducting ELectronics Facility (SELF), of the Shanghai Institute of Microsystem and Information Technology, for their technical support. This work was supported by National Natural Science Foundation of China [Grant Number 12273099].

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Authors and Affiliations

  1. National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai, 200050, China

    Wentao Wu, Zhirong Lin, Zhi Ni, Guofeng Zhang, Yongliang Wang, Liliang Ying, Wei Peng, Lixing You & Zhen Wang

  2. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, 200050, China

    Wentao Wu, Zhirong Lin, Zhi Ni, Guofeng Zhang, Yongliang Wang, Liliang Ying, Wei Peng, Lixing You & Zhen Wang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhirong Lin, Zhi Ni, Wei Peng, Lixing You & Zhen Wang

  4. Center for Transformative Science, Shanghai Tech University, Shanghai, 201210, China

    Shuo Zhang

Authors
  1. Wentao Wu
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  2. Zhirong Lin
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  4. Shuo Zhang
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  7. Liliang Ying
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  8. Wei Peng
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  9. Lixing You
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  10. Zhen Wang
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Contributions

WW contributed to conceptualization, methodology, writing—original draft, data curation, and formal analysis; ZL made a supervision for this work; ZN performed the fabrication of this work; SZ performed the measurement at a temperature of 4.2 K; GZ contributed to the measurement system; YW contributed to discussion and analysis of the data; LY contributed to the development of fabrication process; WP performed operation and maintenance of fabrication platform; LY revised the manuscript; ZW provided the funding support. All persons mentioned above made substantial contributions to the work reported in the manuscript. In addition, the engineers working at the Superconducting ELectronics Facility (SELF), of the Shanghai Institute of Microsystem and Information Technology provide their technical support for fabrication process, but who are not co-author and are named in the acknowledge section of the manuscript and have given their written permission to be named. I agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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Correspondence to Wentao Wu.

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Wu, W., Lin, Z., Ni, Z. et al. Development of a dc-SQUID Amplifier with Intra-Coil Resistors. J Low Temp Phys 214, 143–151 (2024). https://doi.org/10.1007/s10909-023-03029-2

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