Study on transmission characteristics of matching transformer in DC superconducting quantum interference device readout

Liu Ming; Xu Xiao-Feng; Wang Yong-Liang; Zeng Jia; Li Hua; Qiu Yang; Zhang Shu-Lin; Zhang Guo-Feng; Kong Xiang-Yan; Xie Xiao-Ming

doi:10.7498/aps.62.188501

Abstract

In a magnetic flux modulated DC superconducting quantum interference device (SQUID) readout, the matching transformer could realize the function of signal amplification and impedance matching, which is the key element of a low noise SQUID readout. We use a simulated DC SQUID readout to test the characteristics of matching transformer, study the transmission characteristics of transformer with different turns, and confirm its best turn ratio. In the coupling network that the transformer picks up voltage signals of SQUID, We also study the transmission characteristics of transformers with different matching capacitances, realize the matching of the parameters and the optimization in the transformer coupling network. At room temperature, for the matching transformer with a turn ratio of 1:20, when matching capacitance is 1 μF, the gain of output voltage source could reach 21.2 and its bandwidth could reach 210 kHz. Finally, in magnetic flux modulation DC SQUID readout, we evaluate the performance of the matching transformer.

Keywords:

Authors and contacts

1.
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
2.
Electronic Science and Technology Department, University of Science and Technology of China, Hefei 230027, China
Funds: Project supported by the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (Grant No. KGCX2-EW-105), and the One Hundred Person Project of Chinese Academy of Sciences.

References

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Cited By

[1]	John C, Alex I B 2004 The SQUID Handbook Vol.1 Fundamentals and Technology of SQUIDs and SQUID Systems (Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA) p137
[2]	Wang Y L, Wang H W, Xie X M 2008 Rare Metal Mater. Eng. 37 457 (in Chinese) [王永良, 王会武, 谢晓明 2008 稀有金属材料与工程 37 457]
[3]	Zhang L H, Weng Y J, Chen L 1991 Cryo. & Supercond. 19 1 (in Chinese) [张利华, 翁尧钧, 陈烈 1991 低温与超导 19 1]
[4]	Bill W 2001 Handbook for Sound Engineers (3rd Ed.) (Oxford: Focal Press)
[5]	John C, Claudia D T, Giffard R P 1979 J. Low Temp. Phys. 37 405
[6]	Drung D 2003 Supercond. Sci. Technol. 16 1320

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Vol. 62, Issue 18 - 2013-09-20

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