PRACTICAL LOW-NOISE INTEGRATED DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE MAGNETOMETER WITH ADDITIONAL POSITIVE FEEDBACK

被引：18

作者：

RYHANEN, T ^{[1
]}

CANTOR, R ^{[1
]}

DRUNG, D ^{[1
]}

KOCH, H ^{[1
]}

机构：

[1] HELSINKI UNIV TECHNOL,METROL RES INST,SF-02150 ESPOO,FINLAND

来源：

APPLIED PHYSICS LETTERS | 1991年 / 59卷 / 02期

关键词：

INPUT COIL; SQUID;

D O I：

10.1063/1.105974

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have designed and fabricated a low-noise dc superconducting quantum interference device (SQUID) magnetometer that is integrated on a 4 X 4 mm2 chip. The white flux noise of the magnetometer measured in a flux-locked-loop mode using simple, direct-coupled electronics with additional positive feedback (APF) is 6.4 X 10(-7) PHI-0/square-root Hz. The corresponding white flux density noise is 3.9 fT/square-root Hz. The SQUID flux-to-voltage transfer function with APF is enhanced to 4.7 mV/PHI-0 at the optimal working point, thereby significantly reducing the preamplifier contribution to the total noise. A maximum feedback field of 65 nT for frequencies up to 300 Hz and a maximum slew rate of 120-mu-T/s at 300 Hz have been attained using a two-pole integrator.

引用

页码：228 / 230

页数：3

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