Radio frequency bias current scheme for dc superconducting quantum interference device

被引：0
|
作者：
Zhang, Y
He, DF
Wolters, N
Otto, R
Barthels, K
Zeng, XH
Yi, HR
Krause, HJ
Braginski, AI
Faley, MI
机构：
[1] Forschungszentrum Julich, Inst Schicht & Ionentech, D-52425 Julich, Germany
[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1999年 / 9卷 / 02期
关键词：
D O I：
10.1109/77.783858
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have developed a radio frequency bias current scheme with reversal frequency up to 50 MHz for dc superconducting quantum interference devices (SQUIDs). The SQUID and the readout electronics were connected via a quarter wavelength (lambda/4) transmission line. This transmission line not only transported the SQUID signal, but also served as the resonant matching circuit. For a dc SQUID of inductance 115 pH (loop size 75x75 mu m(2)), we measured a flux noise of 33 mu phi(0)/root Hz at 77 K in the flux locked loop configuration. The corner frequency of 1/f noise was less than 0.5 Hz.
引用
收藏
页码：3813 / 3816
页数：4
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