Superconducting quantum interference devices with different damped junctions operated in directly coupled current- and voltage-bias modes

doi:10.1088/1674-1056/23/11/118501

Abstract We investigate niobium thin film superconducting quantum interference devices (SQUIDs) with different Steward-McCumber parameters β_c operated in both current- and voltage-bias modes. We experimentally prove that there is no difference between the two bias modes with respect to the SQUID intrinsic noise and the noise contribution from the preamplifier. Furthermore, the relationships of the SQUID dynamic parameters, (R_d)_{current bias} ≈ (R_d)_{voltage bias} and (∂V/∂Φ)_{current bias} ≈ [(∂i/∂Φ)R_d]_{voltage bias}, are always satisfied. For a strongly damped SQUID with β_c ≈ 0.25, additional positive feedback (APF) and noise cancellation (NC) were employed to enhance ∂V/∂Φ, the former showing a degradation in the linear flux range but otherwise the same with NC. For a weakly damped SQUID with β_c ≈ 3, it is directly connected to the preamplifier without APF or NC, and a low SQUID system noise of about 4 μΦ ₀/√Hz is measured, which is close to its intrinsic noise.

Keywords: SQUID noise bias mode Steward-McCumber parameter

Received: 06 March 2014
Revised: 03 June 2014
Accepted manuscript online:

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	43.50.+y	(Noise: its effects and control)
	85.25.Hv	(Superconducting logic elements and memory devices; microelectronic circuits)

Fund: Project supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04010100) and One Hundred Person Project of the Chinese Academy of Sciences.

Corresponding Authors: Kong Xiang-Yan
E-mail: xykong@mail.sim.ac.cn

Cite this article:

Zeng Jia (曾佳), Zhang Yi (张懿), Qiu Yang (邱阳), Zhang Guo-Feng (张国峰), Wang Yong-Liang (王永良), Kong Xiang-Yan (孔祥燕), Xie Xiao-Ming (谢晓明) Superconducting quantum interference devices with different damped junctions operated in directly coupled current- and voltage-bias modes 2014 Chin. Phys. B 23 118501

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Superconducting quantum interference devices with different damped junctions operated in directly coupled current- and voltage-bias modes

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