Two-stage amplifier based on a double relaxation oscillation superconducting quantum interference device

被引：20

作者：

Podt, M ^{[1
]}

van Duuren, MJ ^{[1
]}

Hamster, AW ^{[1
]}

Flokstra, J ^{[1
]}

Rogalla, H ^{[1
]}

机构：

[1] Univ Twente, Dept Appl Phys, Low Temp Div, NL-7500 AE Enschede, Netherlands

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 15期

关键词：

D O I：

10.1063/1.125001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A low-noise single-chip two-stage superconducting quantum interference device (SQUID) system with a double relaxation oscillation SQUID as the second stage has been realized. The system was operated in a direct voltage readout mode, with a closed loop bandwidth up to 1 MHz. Operated at 4.2 K, the white flux noise measured in flux locked loop was 1.3 mu Phi(0)/root Hz, corresponding to an energy sensitivity of epsilon approximate to 27h. Owing to the large flux-to-voltage transfer of up to 3.6 mV/Phi(0), the room-temperature preamplifier noise did not dominate the overall flux noise. (C) 1999 American Institute of Physics. [S0003-6951(99)01141-9].

引用

页码：2316 / 2318

页数：3

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