超导量子干涉器件读出电路中匹配变压器的传输特性研究

刘明; 徐小峰; 王永良; 曾佳; 李华; 邱阳; 张树林; 张国峰; 孔祥燕; 谢晓明

doi:10.7498/aps.62.188501

摘要

在磁通调制超导量子干涉器件(SQUID)的读出电路中, 匹配变压器具有放大信号和阻抗匹配的功能, 是实现SQUID低噪声读出的关键元件. 利用模拟SQUID电路对匹配变压器进行性能测试, 研究了不同绕制匝数变压器的传输特性, 确定最佳绕制匝数比. 在变压器拾取SQUID电压信号的耦合网络中, 研究了不同电容对变压器传输特性的影响, 实现了变压器耦合网络参数的匹配和优化. 室温下匝数比为1:20的匹配变压器在匹配电容C=1μF时, 输出源电压增益为21.2, 带宽范围可达到210 kHz. 最后在基于磁通调制式DC SQUID读出电路中, 对匹配变压器的工作性能进行了评估与验证.

关键词:

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:

作者及机构信息

1.
中国科学院上海微系统与信息技术研究所, 信息功能材料国家重点实验室, 上海 200050;

2.
中国科学技术大学信息学院电子科学技术系, 合肥 230027

基金项目: 中国科学院知识创新工程重要方向项目(批准号:KGCX2-EW-105)和中国科学院百人计划项目资助的课题.

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.

参考文献

[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

施引文献

[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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