Inductance dependence of noise properties of a high-Tc dc superconducting quantum interference device

Keiji Enpuku, G. Tokita, T. Maruo

研究成果: Contribution to journalArticle査読

19 被引用数 (Scopus)

抄録

Properties of white noise of a high-Tc dc superconducting quantum interference device (SQUID) have been studied using numerical simulation. It is shown that thermal noise at T=77 K significantly affects the noise properties of the SQUID. As a result, dependencies of noise properties on inductance become quite different from conventional results at T=4.2 K. In contrast to the case T=4.2 K, the voltage noise of the SQUID at T=77 K depends very weakly on the inductance, while the transfer function degrades rapidly with inductance. Consequently, rapid degradation of flux noise with inductance, as compared with the case T=4.2 K, is caused mainly by that of the transfer function. These simulation results explain reasonably experimental results reported recently. Therefore, it is necessary to improve the transfer function for the improvement of noise properties in the case of large inductances. Numerical simulation shows that a method for improving the transfer function using resistively shunted inductance or three Josephson junctions, which was proposed by the authors, is also useful for improving noise properties in the case of large inductances.

本文言語英語
ページ(範囲)8180-8185
ページ数6
ジャーナルJournal of Applied Physics
76
12
DOI
出版ステータス出版済み - 12 1 1994

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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